Component cleaning by wet blasting

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Wet blasting (also called vapour blasting, vapor blasting or wet abrasive blasting) cleans components with a slurry of water, detergent and fine abrasive, removing baked-on oil, carbon and corrosion in a single pass with no separate degreasing stage. Wet blasting removes all of it in a single pass. The slurry carries contamination away continuously, the water cushions the abrasive so it cleans without peening over cracks (aerospace NDT), and the process leaves the substrate surface largely unchanged. That means a part that is genuinely ready to inspect, not just visually tidier.

Blasting
Inside the Vapormatt Puma wet blasting machine

How wet blasting component cleaning works in practice

The slurry of water and abrasive flows continuously over the surface, lifting oils and loosening corrosion simultaneously. Because the abrasive is cushioned by water, the process is aggressive enough to shift heat-oxidised deposits from cast iron without raising the substrate surface roughness to a point that affects reassembly tolerances. Abrasive selection is the primary lever: finer, sharper media produces a cleaner surface with less substrate change, which is essential when parts need to pass dye penetrant inspection immediately after cleaning. Plastic media is softer and larger and is very effective at cleaning when the contamination is not excessive. 

Typical setup: component cleaning by wet blasting

  • Abrasive: Aluminium oxide or aluminium oxide blend; 320 mesh for dye penetrant inspection pre-cleaning, coarser grades for heavier corrosion removal. Stainless steel shot where surface change must be minimal.
  • Pressure: 2 to 5 bar (29 to 73 psi) indicative; lower end for delicate or lightly contaminated parts, higher end for heavy corrosion.
  • Guns: Manual or automatic, component dependent.
  • Minimum recommended control: Basic process control is sufficient for an entry-level machine. Pressure adjustment is a key variable.
  • Variables: Aggressiveness increases with pressure and abrasive coarseness. Delicate or close-tolerance parts run at lower pressure with finer media. Internal surfaces require longer dwell time or repositioning.

How Vapormatt controls the wet blasting process

Component cleaning capability: what wet blasting achieves

The parameters shown are indicative and confirmed for the component types listed. The process handles a wide range of contamination types and substrate materials across the component range below.

Component typeTypical size or weightProcess modeAchievable outcomeMinimum control
Cast iron turbocharger parts (turbine housings, bearing housings, diffusers)Up to approx. Ø250mm x 100mmManual or automaticGood cleaning with minimal change to substrate surface finish; heat oxidation, rust, and oil removedBasic manual machine
Polymer extrusion dies, spinnerets and filter componentsØ45 to 60mmManualFull removal of polymer residue and surface contaminants; uniform matte finishBasic manual machine

In Vapormatt sample processing trials, cast iron turbocharger bearing housings contaminated with heat oxidation, rust and oil were cleaned in automatic mode using stainless steel shot and a detergent-corrosion inhibitor solution. Surface roughness went from up to 3.3 µm Ra before processing to 1.8 µm Ra after, consistently across multiple test runs, with substrate change within reassembly tolerance. This shows that effective cleaning is achievable on heavily contaminated cast iron with minimal surface disruption.

For sector-specific cleaning, see our pages on jet engine NDT preparation, aircraft wheel and brake cleaning, aluminium extrusion die cleaning, firearms carbon removal and additive manufacturing powder removal.

Want to see this result on your own parts? Request a sample trial

Wet blasting vs. degreasing, chemical cleaning and dry blasting

Conventional cleaning usually needs two or three processes to deal with mixed contamination. Wet blasting does it in one.

MethodOil and greaseCarbon and corrosionCrack-safe for inspectionProcess stages
Solvent or aqueous degreasingYesNoYesNeeds a second process
Chemical immersionPartlyYesYesMultiple, plus chemical handling
Dry blastingNoYesRisk of peening over cracksPre-degreasing required
Wet blastingYesYesYesOne pass

Cleaned parts also come out with a high-energy surface that is ready for recoating; see coating preparation.

“The machine works well and does a great job at cleaning dies.”

Jacques Naudé, Altus’ Process Improvement Engineer

We use wet blasting to clean aluminium and copper feedstock. It enhances performance.

BWE Ltd., manufacturer of Conform™ continuous extrusion machines
Vapormatt PumaXL manual wet blasting machine

The right machine for your component cleaning application

Vapormate: a compact manual cabinet for small components, low throughput and occasional cleaning, and for running process trials before scaling up.

Puma: the standard manual machine for mixed component types at low throughput with basic process control. The entry point for workshop and MRO cleaning.

Puma XL: the same low-volume profile as the Puma, for larger or heavier components beyond the standard working envelope, with a 1.10m turntable rated to 250kg.

Puma+: a compact automatic machine for smaller batch runs of the same component type, where you want repeatable results without an operator at the gun.

Cougar+: for automated cleaning of high volumes of the same component type, with consistent, repeatable results batch to batch.

Contact us

Tell us about your parts and contamination. An applications engineer will recommend the right abrasive, pressure and machine for your cleaning application.

Talk to an applications engineer

Related machines

Vapormatt Cougar+ automatic wet blasting machine front view with door open and operator
Automatic machines

Cougar+ automatic wet blasting machine

Robust and highly configurable with 32 options. Built for long production runs across demanding applications, from aerospace peening and cleaning to extrusion die maintenance. More details
PumaXL wide
Manual machines

Puma XL manual wet blasting machine

Built for large or heavy components, on a 1.10m (43") swing-out turntable rated to 250kg (551lb), with every feature included. More details
Vapormatt Puma+ automatic wet blasting machine
Automatic machines

Puma+ automatic wet blasting machine

Compact with four configurations, suited to smaller component runs, solid tools, and factories that need consistent automated processing. More details

FAQs

What is wet blasting cleaning, and is it the same as vapour blasting?

Yes. Wet blasting, vapour blasting (vapor blasting) and wet abrasive blasting all describe the same process: a slurry of water, detergent and fine abrasive is propelled at the component to clean it. The water cushions the abrasive, so it removes contamination without the impact damage, dust or surface change associated with dry blasting.

What contaminants can wet blasting remove?

Wet blasting removes baked-on oil and grease, carbon deposits, heat oxidation, rust and surface corrosion, and polymer residue from tooling. Because the slurry contains detergent, oily and corroded contamination can be removed together in a single pass, leaving a clean, uniform surface ready for inspection, reassembly or recoating.

Will wet blasting remove oil and corrosion in one pass, or do parts need pre-cleaning?

Wet blasting removes oil and corrosion in one pass, so no separate degreasing stage is required. Parts can go into the machine as they arrive: the detergent in the slurry softens and lifts oil while the abrasive removes corrosion at the same time. Heavily contaminated internal areas, such as turbocharger volutes, may need longer dwell time or repositioning.

Will wet blasting peen over cracks before dye penetrant inspection?

No, not with the right abrasive. Fine, sharp 320 mesh aluminium oxide is used specifically to avoid peening, and the water reduces impact energy compared with dry blasting, so the surface is left open to penetrant. For jet engine parts processed to Rolls-Royce, Pratt & Whitney or GE specifications, see jet engine NDT preparation.

Do aluminium, cast iron and steel need different wet blasting settings?

Yes. Abrasive and pressure are matched to the material. Cast iron tolerates a more aggressive setup, while aluminium typically runs at lower pressure with finer or plastic media. Pressures usually range from 2 to 5 bar (29 to 73 psi). A basic manual machine has enough adjustment range to handle mixed batches of different materials.

Learn more about the types of abrasive blast media

How do you prove consistent cleaning results from batch to batch?

Run the same pressure and abrasive for each component type, and record surface roughness before and after processing with a stylus roughness meter. In Vapormatt trials, cast iron turbocharger bearing housings were cleaned from up to 3.3 µm Ra to 1.8 µm Ra, consistently across multiple test runs.

Is wet blasting safe for close-tolerance and threaded features?

Yes, when the abrasive and pressure are matched to the part. The water cushions each impact, which protects threads, edges and tight tolerances. Parts with machined bores and spigots have been cleaned without dimensional change.

Can wet blasting also remove paint or heat scale?

Yes, but these are different applications with their own process settings. For removing paint and coatings, see paint stripping. For heavy heat scale on wire, pipe fittings or turbine blades, see descaling. This page covers cleaning oil, carbon and light corrosion from components.