This article provides comprehensive information about abrasive blasting and sandblasting machinery. You will learn how these sandblasters are made and their materials of construction as well as applications, advantages, and drawbacks.
Read further to answer questions like:
Sandblasting machinery includes an array of systems and components designed to project blasting media onto surfaces, serving purposes like abrasion, cleaning, or surface modification. Various media types, such as sand, abrasives, and metal shot, are propelled via mechanisms like pressurized water, compressed air, or a blast wheel to perform these tasks efficiently.
This equipment features a wide variety of types, including:
To answer the question "how do sandblasters work?", it is crucial to understand the advanced sandblasting technology that powers industrial blast equipment. Sandblasting, also known as abrasive blasting, is a process widely used across manufacturing, automotive restoration, surface preparation, shipbuilding, and metal finishing industries.
The underlying technology used to energize or propel the blast media is a key factor in distinguishing different types of sandblasting equipment. Blast machines use either pneumatic air pressure or a blast wheel to project abrasives or media. Selecting the right blasting system is critical for achieving optimal surface roughness, coating adhesion, or contaminant removal depending on the application.
The primary pneumatic propulsion technologies used in blast machinery to clean, peen, or modify surfaces include:
Air or Dry Blast Equipment � Air abrasive blasting (also called dry blasting or sandblasting) uses compressed air to propel the blast media. Industrial pneumatic blasting equipment systems are generally categorized into two types: suction (siphon) and direct pressure.
Suction or Siphon Blast Equipment � Suction sandblasters or blast cabinets employ the venturi siphon effect to pull abrasive into a pressurized stream of fluid, air, or water. This method is popular in automotive sandblasting, industrial maintenance, and light production environments.
Venturi devices use a constriction in a moving fluid stream to create a pressure differential or vacuum. This causes the blast media to be drawn into the air or water stream at the point of constriction.
Venturi principles are used across industries from chemical processing to pneumatic conveying, vacuum clamping, and even pneumatic conveying systems. Siphon blasters are often chosen as entry-level sandblasting solutions due to their ease of use, adaptability, and lower initial investment.
Suction blast cabinets or portable siphon blasting pots are generally more affordable than pressure blast systems. Economy blasters often use suction mechanisms and do not require a pressurized vessel. They consume only half the pressurized air compared to pressure blast cabinets, making them ideal for operations where compressed air supply is a limiting factor. However, suction blasters need higher air pressure to maintain media flow and can struggle with heavier or irregularly sized abrasives.
Suction blast cabinets are less aggressive than direct pressure systems and require more time to achieve a thorough surface clean or profile. They are commonly used for short-run or light production, maintenance, automotive restoration (including paint and rust removal), glass etching, aerospace cleaning, and remote field applications.
The lower aggressiveness of suction or siphon blasters extends the life of both internal machine components and the blast media, reducing operational costs, downtime, and media consumption.
Small handheld sandblasters sometimes feature a gravity-fed cup above the blast gun, using the gun’s venturi point to draw media. These gravity-fed portable systems are classified as suction blasters and are popular for touch-up, mobile, or DIY sandblasting.
Have you ever wondered why direct pressure blasters are more commonly used in industrial and commercial applications compared to suction blasters?
Direct Pressure or Pressure Blast Equipment � Pressure or direct pressure abrasive blast equipment makes use of an industrial-grade pressure vessel to energize the chosen abrasive media. A pop-up or metering valve on the pressure pot is opened to release pressurized air and blast media into the blast hose, delivering consistent abrasive flow.
Direct pressure cabinet blast machines expel blast media at significantly higher flow rates or speeds compared to suction blast equipment. The impact or kinetic energy (K) of the blast media is K = ½ mv², where m is the mass of the blast media and v is its velocity. Doubling the flow rate or velocity results in a fourfold increase in impact energy and blast cleaning efficiency, making pressure blasters ideal for industrial-scale abrasive blasting and paint removal.
Higher media speeds enable direct pressure systems to clean surfaces up to four times faster than suction blast machines, which is essential for meeting high production rates in manufacturing, surface preparation, and shipyard applications. The adjustable pressure levels in direct pressure systems provide pitch-perfect control for cleaning, deburring, surface texturing, anchor profiling, or coating preparation on metal, concrete, or composites.
Direct pressure blast equipment can handle dense, heavy media such as steel shot, cut wire shot, steel grit, or aluminum oxide. Many sandblasting services demand the use of heavier or specialty abrasives for profiling structural steel, preparing weldments, or meeting strict surface finish standards. Suction sandblasters often struggle with heavier media and are limited in industrial capacity and blasting versatility.
Larger diameter blast nozzles, wider-pattern nozzles, or blasting with multiple nozzles requires large capacity air compressors (measured in CFM) to achieve the desired abrasive mass flow rate and blasting pressure. Suppliers often specify blast equipment based on compressor requirements, media type, production volume, and desired blast profile.
Direct pressure sandblasting equipment is preferred for high-volume production, abrasive shot blasting, structural steel preparation, tank/vessel surface cleaning, and automated blasting applications. The higher speeds and ability to operate at greater stand-off distances enhance productivity and keep labor costs in check. Many large fabrication, metal finishing, and OEM production facilities rely on pressure blasters for reliable, repeatable, and efficient operations.
Pressure blasters require two to three times more compressed air (CFM) compared to suction blast systems, which must be factored into equipment selection and cost analysis.
Maintenance and rigorous safety measures are essential for pressure vessel blast equipment. Blast system pressure vessels must comply with the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel (BPV) Codes to ensure operator safety and prevent catastrophic failures.
Wet Abrasive Blast Equipment � Water can be used instead of air to propel the blast media. Wet abrasive blasting (water blasting, vapor abrasive blasting, or dustless blasting) reduces airborne dust by over 90%, a critical consideration in lead abatement, industrial paint stripping, and cleaning hazardous or heavy metal–contaminated surfaces.
Water blast equipment can leverage detergents and anti-rust additives in the water stream, enabling additional surface prepping, removal of grease, and flash rust prevention—requirements common in pipeline maintenance, oil & gas infrastructure, marine, and concrete restoration fields.
Despite the name "dustless blasting," no system eliminates all dust. However, wet blasting is a top choice for silica compliance, dust mitigation, and minimizing exposure risks to hazardous contaminants.
Wet blasting also keeps parts cooler than dry blasting, curbing warpage and reducing risk when blasting thin metals, aluminum, or heat-sensitive components. Applications include steel tank maintenance, bridge repair, concrete surface preparation, and aircraft part cleaning.
Wet blasting systems often feature closed-loop media recyclers, oil separators, demisters, and high-capacity filtration systems for eco-friendly waste management. With reduced media embedment and improved cleaning depth, wet abrasive blasting is a staple in industries demanding strict surface specs or corrosion mitigation.
Dry blasting processes require supplementary dust-removal methods, such as industrial vacuum systems or dust collectors, which are vital in maintaining workplace safety and regulatory compliance.
Rust inhibitors are crucial when wet blasting steel components. Unless treated, parts must be dried, oiled, or painted immediately post-blast to prevent flash rusting—a key concern for facility and maintenance engineers.
Bacteria can proliferate in standing blast water, so regular use of antimicrobial additives is standard protocol in large industrial wet blasting operations.
There are several specialized types of water blasters and wet abrasive blasters available, each tailored for unique site conditions and project requirements.
Slurry Blasting Equipment � Dry blast systems are easily converted for wet abrasive blasting with a water induction or injection kit. Slurry blasters, also called air abrasive water blasters, utilize a water injection nozzle or ring to combine water and media before the blast nozzle, significantly lowering airborne dust and static discharge risk.
Slurry blasters offer flexible blast modes (wet, dry, rinse, dry) suitable for a variety of applications, including masonry cleaning, corrosion control, coating removal, and graffiti abatement. They remain a top choice in building restoration, ship repair, and concrete surface prep where both effectiveness and dust control are required.
Drawbacks include cleanup of wet slurry waste in field scenarios and operator fatigue from heavy water hoses.
Wet Venturi Blasters � Wet venturi blasters are similar to dry suction blasters but operate with a venturi vacuum to draw in an abrasive-water mix, providing mid-tier dust suppression for medium-duty operations.
Vapor Abrasive Blasting Equipment � Vapor abrasive blasting, known as vapor honing or "dustless blasting," combines water and abrasive in a pressurized pot, offering low-dust, low-abrasion cleaning suitable for delicate substrates, historic masonry, and high-specification surface prep.
Vapor sandblasters deliver a wide operating pressure range and the finest control among wet blasting systems, from light paint stripping at 30 psi to "white metal" blasting for corrosion mitigation or shipyard applications. The cushioned media flow is less damaging, making it an eco-friendly option for sensitive restoration, automotive bodywork, powder coating prep, and precision manufacturing.
High-Pressure Water Blasters and Hydroblasters � High-pressure water blasters (aqua cleaners) can remove paint, coatings, and light rust using water alone at pressures up to 6,000 psi, making them invaluable for industrial cleaning, tank maintenance, infrastructure renovation, and paint removal.
For the toughest tasks, ultrahigh-pressure (UHP) hydroblasters operate at 30,000 psi or more, capable of cutting, hydrodemolition, concrete removal, and refractory cleaning without abrasives. These systems are a mainstay for plant maintenance, bridge deck resurfacing, oil refinery shutdowns, and hazardous materials removal where dry abrasive blasting poses explosion or dust risks.
Wheel Blast Equipment - Centrifugal wheel blasting systems dominate industrial settings (foundries, steel mills, automotive plants) for the rapid, automated cleaning of castings, forgings, and large fabricated assemblies. Wheel blasting uses a high-speed spinning impeller to accelerate abrasive media for large-scale, high-efficiency cleaning and shot peening.
Wheel blast technology provides consistent cleaning, descaling, and surface texturing on bulky or complex parts. It is widely used for removing scale, rust, and old coatings from parts such as rebar, vehicle chassis, I-beams, turbines, and pipes.
The choice of blast media—ranging from steel shot and stainless shot to cut wire or metal grit—impacts profile depth, cleaning speed, and equipment longevity. Modern wheel blast systems are engineered for minimal downtime and efficient media recovery, making them highly cost-effective for repetitive, large-batch industrial production.
Abrasive Blasters are used with hard, angular abrasives (e.g., aluminum oxide, silicon carbide, coal slag, garnet, glass bead, etc.) for aggressive scale, paint, or rust removal where a heavy profile is required for subsequent welding, coating, or powder application.
Non-aggressive Media Blasters utilize softer abrasives such as walnut shell, soda, plastic, or corn cob grit—ideal for sensitive surfaces, fire damage, smoke remediation, food-grade equipment, or historic restoration projects, where minimal surface profile is essential.
Shot Peening Machines � Shot peening is a specialized abrasive blasting technique that uses spherical media (steel shot, stainless, glass bead, ceramic balls) to impart compressive stresses, increasing fatigue resistance, and lifespan of aerospace, automotive, or spring components. Shot peeners utilize centrifugal wheel or pressure blasting systems for controlled, precision delivery of peening media in compliance with AMS, Mil-Spec, or Nadcap requirements.
Ice Blasters (Dry Ice & Water Ice Blasting) - These cleaning systems use frozen CO2 pellets or solid water ice for zero-residue, dry cleaning of industrial surfaces, food processing equipment, plastic molds, and even cleaning sensitive electronics or space telescope mirrors. The media disappears—dry ice sublimates to gas, and water ice evaporates—reducing secondary cleanup, waste disposal, and environmental impact.
Both dry ice and water ice blasting are gaining popularity as eco-friendly, non-abrasive alternatives for the removal of surface deposits, sensitive cleaning, or process maintenance, contributing to sustainable manufacturing practices.
Modern sandblasting equipment is available as complete blasting machines, modular blasting systems, or pre-packaged abrasive blast setups tailored to customer requirements. Leading manufacturers offer custom-configured solutions, allowing you to select compatible components—blast guns, wear-resistant nozzles, , valves, deadman controls, blast cabinets, blast rooms, and flexible or reinforced blast hoses—matching each unique application.
Sandblasting machines come in various sizes and layouts—from micro-precision benchtop blasters, laboratory-grade equipment, and mid-size cabinets, to high-throughput automated lines and heavy-duty mobile field units for industrial sandblasting and on-site surface preparation.
Benchtop Micro Blasters and Pencil Blasters � Micro-abrasive blasting equipment, also known as pencil blasters, features small-diameter nozzles (from 0.018 to 0.125 inches, often constructed from sapphire or single-crystal alumina) and fine abrasives (media sizes 10�350 microns). These micro-desktop systems perform pinpoint cleaning, deburring, stencil etching, or precision surface texturing in medical device manufacturing, dental labs, electronics, watchmaking, jewelry, and semiconductor industries.
Their accuracy and gentle abrasive action also serve miniature assembly, stent finishing, artwork restoration, and microfluidics applications where standard sandblasting would be too aggressive.
Manual Blast Cabinets or Cabinet Blasters � Shop-grade blast cabinets provide a safe, contained environment for manual abrasive blasting. Fitted with rubber gloves, LED-lit viewing windows, and ergonomic grating, these units are a staple in auto body shops, manufacturing, maintenance, and custom fabrication environments. They enable spot blasting, coating removal, and controlled etching.
Blast cabinets reclaim and recycle abrasive media for cost control and waste reduction. Premium cabinets provide media separators, advanced dust filtration, and contoured seals to curb leaks, providing safer operations and regulatory dust compliance for industrial users.
Innovations in blast cabinet design—like those offered by Titan Abrasive Systems—address chronic issues such as door leaks and warping through reinforced multi-panel, knife-edge doors, ensuring airtight seals and reducing maintenance frequency. Flexible door and loading configurations (front, top, side, multiple) maximize productivity for small batch blasting, rapid turnarounds, or prototyping.
Pass-through blast cabinets offer continuous sheet or plate processing and are widely used in glass, metal fabrication, finishing, and sign-making industries.
Typical environments for manual blast cabinets include machine shops, custom fabrication, auto restoration, prototyping labs, education/training centers, and electronics repair shops.
Production-grade sandblasting equipment is engineered to withstand the harsh, repetitive requirements of heavy industrial use. These high-capacity systems are optimized for handling large components or bulk part batches such as castings, forgings, extrusions, automotive assemblies, and aerospace structures. They can be integrated into lean manufacturing lines or automated work cells for continuous, high-throughput operation.
Equipped with multiple blast guns or wheels, industrial sandblasting machines can rapidly process large workpieces and ensure consistent surface preparation, which is essential for downstream coating, welding, or assembly quality. Simultaneous use of multiple blast guns increases air and media consumption, so abrasive recovery and dust management systems are vital for operational efficiency and meeting EH&S (Environmental, Health & Safety) regulations.
Automated vs. Manual Production Blasting � Automation maximizes output quality and throughput for high-volume production. From semi-automatic systems (operator loads/unloads parts) to fully programmable robotic systems, automation improves repeatability, reduces scrap/rework, and lowers labor costs—key benefits for contract surface finishing services, OEMs, and Tier 1 suppliers.
Robotic sandblasting technology, utilizing CNC-controlled robotic arms, is fast becoming the industry standard in sectors where tight tolerances and consistent results are mandatory—such as aerospace, medical device manufacturing, and precision instrument finishing.
Batch and Pass-through Blast Chambers � Batch blasting systems (including tumble and rotary table blasters) enable mass processing of parts, while pass-through systems (with conveyorized or roller doors and sealed openings) support continuous flow operations for steel mills, coil coatings, pipe manufacturing, and structural steel prepping.
Inline and Continuous Blasting Systems � For ongoing, high-volume production, in-line sandblasting systems are integrated directly into process lines. Used for routine cleaning, scale removal, or pre-coating preparation of strip steel, sheet metal, pipes, and profiles, these systems offer supreme process control and traceability for quality-focused environments.
The Eco Pickled Surface (EPS) process exemplifies a leading-edge, environmentally friendly approach using steel grit blasting to achieve surface finishes with optimal weldability and paint adhesion, eliminating the need for acid-based pickling and reducing chemical waste.
Blast Rooms � Blast rooms (abrasive blasting enclosures) facilitate refurbishment, coating removal, and surface prepping for extra-large parts such as tanks, railcars, ships, or industrial equipment. They are essential in shipyards, rail depots, heavy equipment manufacturers, and metal fabrication plants. Proper grating, media recovery, dust collection, and operator PPE (including NIOSH-approved respirators and ventilated suits) are critical for safety and productivity.
Blast Booth Lifts & Operator Protection � Modern blast rooms incorporate operator lifts, integrated ventilation, and remote-control systems to maximize ergonomics and reduce fatigue during extended blasting cycles. Safety requirements include OSHA-compliant suits, breathing air supply, and acoustic controls.
Media Separators and Dust Collectors are standard in modern production setups, separating reusable abrasive from dust and debris, supporting sustainability, compliance, and total cost of ownership objectives.
Tumble Blasters � Incorporate a rotating basket or rubber belt to tumble and evenly blast parts. They're widely used for de-scaling, deburring, or cleaning fasteners, small castings, and hardware.
Table Blasters � Feature large rotating tables for multi-angle cleaning of bulky components such as engine blocks, steel castings, and structural weldments. Manual flipping may be necessary for total coverage, especially on complex geometries.
Hanger Blast Systems � Ideal for large or delicate parts that cannot be tumbled—parts are suspended for thorough 360-degree blasting, perfect for chassis, frames, or fabricated assemblies.
Wire Mesh Belt Blasters � Leverage a heavy-duty wire mesh conveyor to move parts through the blast zone, offering non-stop production for plate, sheet, or extruded profiles—key in metal service centers and fabrication shops.
Monorail Blast System � Use overhead rails to carry parts through an enclosed blast chamber, supporting automated or high-mix part processing.
Roller Conveyor Blast System � Automated blast system used for cleaning heavy steel plates, rolled beams, tube sections, and fabricated weld assemblies—especially in shipbuilding, bridge fabrication, and steel service industries.
Portable Blasters and Blast Pots � Portable abrasive blasting systems are designed for on-site surface preparation, rust removal, pipeline maintenance, bridge refurbishment, tank cleaning, and other field applications where mobility is essential. Field sandblasting units are engineered for durability, easy transport, and fast setup in remote locations.
Walk-Behind and Vertical Blasters � Used for surface prep of concrete floors and vertical surfaces, these machines integrate dust collection and are essential on construction sites, parking decks, warehouse floors, bridges, or tank exteriors.
Blasting Trailers and Blasting Trucks � Full-service mobile sandblasting operations require truck- or trailer-mounted abrasive blasters, self-contained with engine-driven compressors, media pots, hoses, and on-board operator shelters for all-weather productivity and rapid project deployment.
Internal and Pipeline Blasters � Internal pipe blasting equipment features specialized ID lances, rotating heads, and tungsten carbide nozzles to scour pipe interiors in oil & gas, municipal water, or industrial processing facilities. Proper pipe surface prep ensures optimum lining and corrosion protection.
Spin blast tools with adjustable arms and centrifugal rotating spray ensure comprehensive, uniform cleaning inside pipes of varying diameters—a crucial step for safe pipeline maintenance and restructuring.
Sandblasting equipment is assembled from a diverse range of components including cabinets, pressure vessels, hoses, guns, and nozzles. Each of these parts is produced using various manufacturing techniques such as sheet metal fabrication, casting, welding, mechanical fastening, machining, and other specialized methods.
Blast cabinets and blast rooms generally begin as constructed metal enclosures. These are typically created by cutting, bending, and shaping steel sheets, plates, and structural steel to form the necessary sides, legs, and doors to complete the box structure.
By incorporating additional elements such as blast guns, viewing windows, glove ports, doors, turntables, grating or screens, gun or part holders, pneumatic valves, foot pedals, lighting, hoses, and reclamation systems, the basic enclosure evolves into a robust industrial tool: a blast cabinet or blast room.
Blast cabinets can be assembled using welding or mechanical fastening methods. Fastening methods facilitate easier removal for maintenance, cleaning, and part replacement. On the other hand, welded cabinets offer a more airtight seal, reducing leakage of media and dust into the workspace, though replacing worn components can be challenging.
Over time, the abrasive blast stream causes wear to the bottom and sides of the cabinet. The seals and windows also degrade with use and will eventually need replacement.
What materials are used in the construction of sandblasters?
Dry or air blasting cabinets and rooms are typically constructed from steel, which may be coated with powder, zinc galvanization, or industrial paint. For wet blasting applications, materials like stainless steel are preferred due to their resistance to corrosion.
In specific dry blasting scenarios, such as those involving surgical instruments or medical implants, stainless steel might be used to prevent iron contamination of surfaces.
When blasting stainless steel parts, stainless steel shot or non-metallic abrasives are commonly used. Steel shot or steel parts can transfer metal particles to the stainless surface, potentially compromising its passivation layer and leading to rust.
To minimize wear on blast machines, wear-resistant steel liners or wear plates are installed within blast chambers. These liners are made from alloys known for their durability, such as manganese steels like Manganal and nickel-chromium white cast irons like Ni-Hard alloys.
What Components and Consumables Are Found in a Sandblaster?
Sandblasting equipment often suffers from wear and tear due to the harsh nature of the blast media. Components of the blaster are considered consumables and gradually degrade as abrasive or media continually flows through or impacts these parts.
Blast media itself is also subject to consumption. Some abrasives like steel shot, ceramics, and aluminum oxide can be recycled multiple times within the blaster, whereas materials such as soda, dry ice, sand, and coal slag are typically used only once.
Components in abrasive blasters, wheel blasters, and shot peening machines must be regularly checked for wear and tear. Changes in the nozzle's inner diameter or alterations in the geometry of throwing blades can significantly affect the efficiency of the blasting operation.
Sandblaster parts are:
Blast nozzles are made of extremely wear-resistant materials are:
Among the most durable materials for sandblasting nozzles are boron carbide, alumina, pure tungsten carbide (WC), and silicon carbide ceramics.
Depending on the type of blast media used, nozzles made from cemented tungsten carbide and SiAlON can last 10 to 20 times longer than those made from ceramic or alumina. Boron carbide stands out as the hardest and most wear-resistant option among these materials.
Although boron carbide generally costs about three times more than cemented tungsten carbide, it can last anywhere from 3 to 25 times longer than tungsten carbide or SiAlON nozzles. However, boron carbide lacks the toughness and impact resistance that cemented tungsten carbide offers. Binderless tungsten carbide (WC) nozzles have twice the lifespan of boron carbide nozzles.
Steel nozzles are suitable for use with air blow guns, washout guns, and for blasting exceptionally soft media like soda, dry ice, walnut shells, and plastic grit. They are less likely to break if dropped. Inexpensive sandblasters intended for home or DIY use often feature steel nozzles.
For wear resistance alone, boron carbide and binderless tungsten carbide nozzles can last up to seven times longer than cemented tungsten carbide. However, boron carbide or silicon nitride nozzles are more prone to cracking if they strike a part, grate, or cabinet wall compared to cemented tungsten carbide nozzles.
The service life of nozzles can vary based on the type of media being used. Nozzles tend to wear out more quickly when blasting sharper, angular steel grit compared to spherical cast shot. Similarly, materials like aluminum oxide and silicon carbide will cause faster nozzle wear than garnet or coal slag. In contrast, nozzles used for blasting softer media such as plastic, soda, corn cobs, or walnut shells can last much longer, potentially even indefinitely.
Beyond consumables and wear components, there are various sandblasting accessories and ancillary equipment designed to enhance the blasting process:
Both sandblasting and shot peening operations necessitate the use of personal protective equipment (PPE) for operators to ensure safety:
Sandblasting equipment can alter the surfaces of parts or structures in numerous ways, depending on the type of media used and the blasting parameters. Softer media applied at lower pressures can delicately strip coatings, while high-pressure projections of extremely hard abrasives can aggressively etch, texture, or carve surfaces. For instance:
Sandblasting equipment offers various end-use and surface modification functions that can enhance your production processes:
Cleaning / Stripping � Mechanical cleaning through impact or abrasive blasting is one of the most common applications for sandblasting equipment. It is highly efficient at cleaning surfaces and removing substances such as rust, oxide scale, mineral deposits, corrosion, grease, dirt, coatings, sealants, carbon deposits, and varnish.
Unlike wire brush wheels, abrasive belts, and abrasive discs, which tend to clog quickly when dealing with paints, coatings, and contaminants, abrasive blasting transforms these materials into dust, which is then managed by dust collectors, industrial vacuums, and separators.
The aggressiveness of the cleaning process can be adjusted by selecting different blast media, pressures, flow rates, and types of blasting machines. For example, abrasive blasters can delicately remove graffiti, paints, and coatings without affecting the underlying material.
Alternatively, an abrasive blaster can aggressively clean a steel surface to achieve a NACE/SSPC "white metal" cleanliness grade by thoroughly removing all rust, scale, or other contaminants.
Blending, Smoothing, and Surface Finishing � Sandblasting is effective for eliminating marks and machining lines left from grinding and other processes. Spherical media, such as steel shot and glass beads, are particularly adept at blending and enhancing surface finishes.
The rounded edges of these media gently flatten high spots on the surface, resulting in a brighter, matte finish. In contrast, using sharp, angular abrasives achieves a duller, satin finish, which offers excellent bonding properties.
Refining Surface Finish and Enhancing Fatigue Strength � Improving the surface finish or reducing the surface profile can significantly boost fretting fatigue strength, potentially increasing it by 20% to 200%. To achieve this, a larger diameter or heavier cast shot can be used initially to introduce a deep residual stress layer. Subsequently, the surface is peened with smaller spheres or microbeads to refine the finish.
If the part has a rough surface finish, such as that found in as-cast or as-forged components, peening can modestly improve the finish. However, if the part has been ground or machined to a smooth or low Ra finish, shot peening may result in a rougher surface profile.
Deflashing � Flash or excess material often forms at the seam where the two halves of a mold meet during plastic molding, rubber molding, sand casting, or die casting. This flash on molded metal, plastic, or rubber parts needs to be removed, and the remaining parting line blended.
Plastic and rubber parts are sometimes cryogenically frozen with liquid nitrogen at -300°F (-184°C). This process makes the plastic and rubber flash brittle, allowing it to be easily removed by blasting.
Deburring � Metal parts often develop slivers, attached swarf, and sharp protrusions during various operations such as sawing, machining, drilling, cutting, shearing, and grinding. These imperfections can pose safety risks by cutting workers or customers, creating handling hazards. Sandblasting is an efficient solution for removing these burrs, including those in hard-to-reach recesses where conventional deburring tools might struggle.
Burrs and slivers can pose significant safety risks, potentially causing injuries to hands and creating handling difficulties. Sandblasting offers a quick method to eliminate these issues, effectively cleaning edges and recesses that mechanical tools might not be able to reach.
Demolition / Cutting � Ultra-high pressure water jets or water blasters are utilized for demolishing concrete, cutting rebar, and opening pressure vessels for maintenance and inspections. Another related technique, abrasive water jet cutting, is capable of creating complex 2D patterns in virtually any type of sheet or plate material without the thermal damage associated with plasma or flame cutting.
Drilling / Carving � Micro abrasive blasters are adept at drilling tiny holes in printed circuit boards. They can also carve intricate designs into materials like glass, wood, and stone, allowing for the creation of both 2D patterns and 3D shapes.
Patterning / Marking � Abrasive blasting is employed to etch designs, part numbers, and text onto surfaces. This is achieved using various masking materials such as tapes, films, and compounds, which protect the areas not intended for blasting. These masking materials are generally soft or flexible to ensure that the protected areas remain unaffected.
Micro-abrasive blasters are equipped with very fine blast patterns, enabling precise tasks such as patterning, deburring, cleaning, marking, and even drilling or cutting without the need for masking in certain situations. They are particularly effective for cutting slots and holes in semiconductor wafers or milling channels into ring bearings.
Surface engineering involves altering the surface properties of a part to impart specific characteristics that either enable or improve its performance for particular applications.
Peening involves bombarding the surface with spherical media such as steel, stainless steel, glass, or ceramic to induce strain hardening and create compressive residual stresses on the part. Commonly used media includes cast steel shot with a Rockwell C hardness ranging from 40 to 55.
Shot peening can enhance the fatigue strength of components by as much as 30% to 500% due to the induced compressive residual stress. This improvement in fatigue strength and resistance to stress-corrosion cracking is crucial for components like fasteners, gears, axles, dies, molds, shafts, springs, aircraft landing gear, and other rotating and structural parts.
Etching / Surface Profiling � This process involves creating specific surface textures, roughness, and profiles. A roughened surface improves the adhesion of coatings, paints, and adhesives compared to a smooth one. Abrasive blasting creates an anchor profile with undercuts and increased surface area, which enhances the bonding of coatings and adhesives.
A sandblasted surface on stainless steel handrails also improves grip, benefiting users. Additionally, etching can modify the frictional properties of a surface, which is advantageous in mechanical power transmission applications.
Surface Preparation � This process involves both cleaning the surface and creating an anchor profile or modifying surface roughness. Proper surface preparation is essential before applying coatings, paints, galvanizing, oiling, welding, brazing, sealing, soldering, adhesive bonding, or rubber-to-metal bonding.
For optimal adhesion, surfaces must be free from grease, oil, dust, and dirt. Contaminants can interfere with bonding by acting as a barrier or a release agent. Effective cleaning is crucial to ensure proper chemical bonding and adhesion.
It is also important to remove rust and corrosion, especially when applying protective coatings that must meet the standards set by the National Association of Corrosion Engineers (NACE) and the Society of Protective Coatings (SSPC). Abrasive blasting is commonly used for rust and corrosion removal for three main reasons:
Standards such as those from NACE, SSPC, and ISO 8501 offer visual guidelines for evaluating surface cleanliness and the extent of rust, mill scale, and other contaminants. NACE and SSPC have collaborated on a joint standard specifically for Industrial Blast Cleaning.
These standards range from the lowest cleanliness grade, known as "Brush Off," to the highest cleanliness grade, "White Metal."
Is your surface truly "profiled"?
Even if a surface appears clean, it may not be adequately "profiled" for optimal adhesion. Smooth surfaces offer few anchor points for paints and coatings. By contrast, a surface that has been roughened through blasting provides better mechanical interlocking for coatings, ensuring a more secure bond.
Should you use the roughest and sharpest blast media for surface preparation?
Not necessarily. While a rough surface can enhance bonding, overly aggressive blasting might lead to problems. Excessive roughness can cause thinner coatings to leave pinholes or fail to cover the surface adequately, leading to potential corrosion issues. For improved coating performance, some of the high peaks on the surface profile can be reduced through more controlled blasting techniques.
Coarse grit blasting is effective for applications requiring strong bonding, such as thermal spray deposits, thick coatings, and polymeric linings. However, for thinner coatings and paints, a less aggressive profile with fewer sharp peaks is preferable. This can be achieved using spherical media like round steel shot or glass beads, which create a more uniform surface profile.
Aerospace � Plastic media blasting is employed to remove old paint from aluminum aircraft skins while preserving the underlying aluminum metal. This process is crucial for maintaining the integrity of the aircraft structure. Additionally, blasting plays a role in the refurbishment of jet engine parts and in non-destructive testing (NDT) for inspecting aircraft structural components.
Additive Manufacturing / 3D Printing � In additive manufacturing, abrasive blasting is used to remove support material from 3D-printed parts. It also helps in smoothing surfaces and blending striation lines that may appear during the 3D printing process, enhancing the final finish of the printed object.
Agriculture � Sandblasting equipment is utilized to clean and remove rust, as well as dislodge soil from farming machinery such as tillers, tractors, cultivators, harvesting machines, reapers, pickers, and pesticide sprayers.
Automotive OEM � In automotive manufacturing, abrasive blasting is essential for etching, cleaning, and preparing automotive parts before processes like welding, adhesive bonding, and painting. Additionally, many castings, forgings, and machine components undergo shot peening to enhance material properties and extend their lifespan.
Automotive Aftermarket � Sandblasters are crucial tools in auto body shops and repair garages. They are used for rust removal, body and engine repairs, and the restoration of antique vehicles.
Adhesive Bonding / Sealant Application � Surface cleaning and anchor profile generation through sandblasting increase the bond strength of adhesives and sealants, ensuring a more secure application.
Architectural / Building & Construction � Sandblasting is employed to remove paint and rust from steel, concrete, and wood surfaces in buildings. Soda blasting is particularly effective for architectural cleaning tasks such as graffiti removal, paint stripping, and cleaning and deodorizing areas affected by fire, smoke, and mold.
Vertical sandblasters are designed for cleaning brick, stone, and concrete walls. Walk-behind sandblasters, which are wheeled across surfaces, are used to clean concrete floors before recoating. Both vertical and walk-behind blasters often feature integral vacuum systems to collect blast media and dust.
Chemical Plants / Refineries � In chemical plants and refineries, where corrosion is a persistent issue due to exposure to acids, salts, and other corrosive substances, sandblasting is essential for removing corrosion from tanks, pipes, valves, and pumps.
Corrosion under insulation (CUI) is a common challenge in these facilities, particularly with insulated piping systems. Sandblasting is used to remove corrosion from beneath the insulation, after which a new protective coating is applied before reinsulating the pipes.
Coatings on industrial flooring and concrete walls in chemical plants often deteriorate or wear out over time. Walk-behind and vertical blasters are employed to strip away old coatings and prepare the surfaces for the application of new industrial coatings.
Coating and Paint Application � Sandblasting plays a crucial role in surface preparation by cleaning and creating an anchor profile, which enhances the bond strength of paints and protective coatings. It is indispensable for preparing surfaces to accept new coatings and for ensuring proper adhesion.
When recoating or repainting surfaces, sandblasting is necessary to strip away old, damaged coatings and rust before applying a new layer.
Corrosion Control Industry � In the corrosion control industry, sandblasting is used to strip away damaged coatings, paint layers, rust, corrosion, grease, dirt, adhesives, and sealants in preparation for recoating or repair. Non-destructive testing (NDT) inspections or corrosion assessments also require precleaning of surfaces.
Surface preparation standards and cleanliness grades established by organizations such as the International Organization for Standardization (ISO), National Association of Corrosion Engineers (NACE), Society of Protective Coatings (SSPC), and American Society for Testing and Materials (ASTM) are crucial for properly preparing surfaces before applying protective coatings.
NACE estimates the annual cost of corrosion to be $2.5 trillion!
Sandblasting equipment is one of the most powerful tools in corrosion engineers' arsenal to combat the ongoing battle against rust and corrosion.
Bridge & Highway Maintenance � Weathering, erosion, and corrosion gradually deteriorate structures. Without proper maintenance, bridges and other infrastructure can suffer significant damage, potentially leading to catastrophic failures.
Blasting is essential for maintaining concrete and steel structural members on bridges, overpasses, and highways. It removes old protective coatings, facilitates inspection, and prepares surfaces for the renewal or reapplication of protective coatings.
Electronics / Electrical � Micro abrasive blasters are invaluable tools for electronics repair. They can precisely remove solder where reflow desoldering is impractical and strip conformal coatings that cannot be removed with heat or chemicals. Micro-blasters are also used to drill holes or vias in printed circuit boards (PCBs) and clean surfaces for soldering or brazing. A clean metal surface is more readily wetted by molten solder or braze.
Foundries and Forges � In foundries and forges, abrasive blasters like centrifugal wheel blasters and pressure blasting equipment are vital for cleaning operations. After shakeout, castings are blasted with metal shot or grit to remove residual mold sand and ceramic investment material, followed by cleaning to remove any surface oxide scale. Forged parts are also blasted to eliminate die lubricant and descaled oxide layers.
Glass Fabricators � Glass panes or windows, glass bowls, glass cups, and other decorative glass objects can be frosted or patterned using stencils or masks. Microblasting is another method used to etch or engrave text and graphics onto a glass object.
Sandcarving uses abrasives to deeply etch away glass and create 3D relief patterns or images. Glassware is usually blasted with 180 grit silicon carbide.
Jewelry / Fossils - Micro blasters with soft grits can clean delicate surfaces, such as removing encrustations on fossils. Micro-blasting with abrasives that are softer than gemstones can clean jewelry without damaging precious stones.
Machine Shops / Manufacturing � Most machine shops, fabricators, and manufacturers have at least one blast cabinet for cleaning, degreasing, deburring, and surface preparation of machined or fabricated parts. Dies, molds, drills, end mills, saw blades, and other tools are also blasted to remove burrs and embedded debris stuck on cutting edges or between teeth. Shot peening can enhance the fatigue strength and life of machined or ground shafts, tools, and structural parts.
Marine � Sandblasting is crucial in boat and shipbuilding and maintenance. Decks, hulls, and interior surfaces need protection from the corrosive effects of ocean salt sprays and mists.
Fouling on the bottoms of ship hulls increases drag, resulting in higher fuel costs for major shipping companies. Ship hull bottoms are cleaned by blasting to remove algae, barnacles, and marine life before recoating with low drag, ablative bottom coatings.
Medical / Dental � Cleaning, coating preparation, etching, and polishing of medical devices and dental restorations. For instance, the investment or mold material on cast crowns or bridges can be carefully removed using a small benchtop sandblaster or micro-blaster. Hip, shoulder, dental, and other bone and joint implants are blast cleaned to comply with strict FDA cleanliness standards.
Mining & Gas & Oil Fields � Various mining, gas, and oil field equipment needs rust removal and protective coating. Sour gas contains hydrogen sulfide, a toxic and highly corrosive chemical.
Monuments / Tombstones � Portable sandblasters can etch or clean stone monuments and tombstones in remote locations such as national parks and graveyards.
Nondestructive Testing (NDT) � Coatings, rust, corrosion, grease, and other surface contaminants must be removed before structural components can be inspected for surface and subsurface cracks and defects. Ultrasonic, eddy current, penetrant testing, magnetic particle, and visual testing methods require a clean surface for accurate evaluations.
Plastic / Rubber Molding � Deflashing molded parts and cleaning excess resin from molds or forms. Dry ice blasting is commonly used for cleaning plastic and rubber molds. Rubber becomes brittle at low temperatures and can be abraded away, while cryogenic blasting is used to deflash rubber and plastic parts that have been cooled to cryogenic temperatures.
Rail / Mass Transit � Railcars, tanker cars, railcar wheels, and track mechanisms are cleaned to inspect for cracks and corrosion and to prepare for protective coating applications. Blast rooms or portable blast pots are typically used for cleaning and surface preparation of rolling stock.
Remanufacturing � Used or damaged engines, blocks, heads, brakes, and transmissions are repaired or refurbished by remanufacturers. Sandblasting equipment cleans these components to remove rust, grease, gaskets, and coatings from surfaces. Mating surfaces are ground to eliminate warpage, and cylinders are reground or relined. The remanufactured engine is then reassembled and either returned to service or resold.
Steel / Metal Mills � Sandblasting equipment is utilized in primary and secondary metal and steel mills for descaling and cleaning metal sheet, plate, strip, bar stock, rod stock, and other shapes. Scale or metal oxide formed during hot rolling, extrusion, drawing, or other thermomechanical processing is removed with abrasive blasting media. The blast nozzles are positioned over the moving metal or steel plates, continuously cleaning the metal stock as it progresses along the production line.
Thermal Spray Coating � Creating an anchoring surface profile with abrasive blasting is essential for achieving strong bond strength in thermal spray coatings on jet engine blades and other critical components. Thermal spray coatings will delaminate from smooth, unblasted surfaces.
Welding, Brazing & Soldering � Abrasive blasting is used before welding, brazing, and soldering to clean surfaces and ensure solid joint formation. After joining, additional blasting removes slag, rosins, oxide patinas, and weld spatter before applying protective coatings.
Woodworking / Cabinetry � Sandblasting removes paint or wood sap from wooden cabinets, furniture, and trim before painting. It is also used for wood carving and sign etching.
Sand Blasting Advantages
Certain materials such as lead-based paints and heavy metals generate harmful or toxic dust when blasted. In these applications, specialized vacuum blasting systems or systems with high MERV filtration is required to prevent the release of harmful materials.
Operators should use a breathing air supply filter when blasting hazardous materials any material generating fine, respirable dust in a field or open factory environment.
Proper collection, handling, and disposal of the media are required as well. Wet or water blasting systems reduce the dust problem.
Answering these questions will assist you in choosing the appropriate blasting system for your surface treatment needs.
Industries worldwide utilize abrasive blasting for various purposes, including cleaning rust and oil, removing surface coatings like paint and pollutants, preparing surfaces for paint and coatings, reinforcing metal surfaces and...
Sandblast cabinets include systems or machinery and components for projecting blast media against a part‘s surface to abrade, clean, or modify the surface. Sand, abrasive, metal shot, and other blast media are driven or propelled using pressurized water, compressed air, or a blast wheel...
Shot peening equipment includes systems or machinery and components for projecting shot peening media against a part‘s surface to modify the surface or surface engineer the part...
An aqueous part washer is an automated or semi-automated machine manufactured to clean, remove tough grease, and dry large or small parts before distribution or surface treatment. The washing is necessary since...
Automated parts washers are mechanical devices designed to efficiently remove grit, oil, grime, dirt, paint and other contaminating substances from parts with minimum manual supervision. These substances are removed...
Deburring is a secondary operation of a machining process that enhances the final quality of the product by removing raised edges and unwanted pieces of material, known as burrs, left by the initial...
Finishing machines are machines used for metal finishing, which is the last stage of the metal fabrication process; the stage encompasses the use of machines in finishing the metal surface...
A parts cleaner is a cleaning device that uses various types of solvents, cleaning agents, and processes to remove grease, grime, and contaminating materials from manufactured parts prior to shipment or movement for further processing...
A parts washer is a mechanical device designed to remove grit, grime, oil, miscellaneous debris, dirt, paint, and other contaminating substances from parts in preparation for their use in assembly operations, packaging, or coating...
A tumbling machine is a durable deburring and metal-polishing machine designed for finishing large parts or batches of smaller parts. A tumbling machine is also known as a barreling machine or a mass-finishing...
An ultrasonic cleaner is a type of sonic cleaner or sonic cleaning machine that uses cavitation to remove unwanted material. The cleaning effect is created by the compression and refraction of a cleaning medium. Miniscule vibrations propagate throughout the...
Ultrasonic cleaning is a type of cleaning process which uses cavitation induced by alternating compression and rarefaction cycles at ultrasonic frequencies. Ultrasonic frequencies are sound waves vibrating at 20 kHz or higher...
Vibratory tumbler is the equipment used in a vibratory finishing process, one of the most common methods in mass finishing. But how does a vibratory tumbler work...
A wastewater evaporator is a method of removing water from water-based waste by converting the water in the waste to a vapor and leaving contaminants. The function of a wastewater evaporator is to reduce the volume of waste materials...
Parts washers are designed for cleaning, degreasing of equipment, and drying of mass quantities of small or large parts in preparation for surface treatment, assembly, inspection, or shipment...