Slurry blasting takes its name from the mixture at the centre of the process: fine abrasive held in suspension in water, at a concentration that has to stay inside a narrow band for the result to stay consistent. In everyday use, "slurry blasting" and "wet blasting" describe the same thing. This page looks specifically at the slurry itself - what's in it, how it's mixed and delivered, and why holding it steady is what separates a controlled process from an inconsistent one.
New to the process? Read the full explanation of how wet blasting works
What's actually in the slurry
The slurry is a suspension of abrasive media - commonly glass bead, aluminium oxide, or another fine-grade abrasive - in water, held at a concentration measured by volume or weight ratio. Get the ratio wrong and the process drifts: too little abrasive and cycle times stretch out; too much, and nozzles wear faster while the finish turns coarser than intended. Most Vapormatt machines either measure and adjust blast media concentration levels automatically, or feature a 'sight glass' that allows quick and accurate measurement of blast medica concentration levels.
How the slurry is mixed and delivered
Wet blasting equipment generally takes one of two approaches to bringing abrasive and water together. Some systems premix the slurry in a pressurised vessel, so abrasive and water travel to the nozzle already combined. Others introduce water separately, closer to the nozzle itself, with abrasive fed into the stream at the point of blasting. Both are legitimate engineering approaches - what matters more than which one a machine uses is whether the resulting slurry is held at a consistent concentration for the length of a production run, something Vapormatt has perfected over many decades and is unrivalled at achieving.
Why slurry consistency is what separates a controlled process from an inconsistent one
Left alone, a slurry doesn't stay uniform - heavier abrasive particles settle, water evaporates or gets topped up, and concentration drifts over the course of a shift. A machine that recycles and continuously monitors the slurry corrects for this automatically, so the tenth part off the line is blasted with the same mixture as the first. A machine that doesn't will drift, and it's the operator, not the equipment, left responsible for holding the process steady.
See what a controlled, repeatable wet blasting process actually delivers
Not to be confused with
'Slurry blasting' is sometimes confused with 'slurry blasting agents' used in mining and quarrying - an entirely different, chemically explosive product used for rock blasting. If that's what brought you here, this page (and Vapormatt's equipment) isn't what you're looking for.
FAQs
Is slurry blasting the same as wet blasting?
Yes. Slurry blasting and wet blasting describe the same process. 'Slurry blasting' specifically emphasises the water-and-abrasive mixture itself, while 'wet blasting' is the more general term for the process as a whole.
What's the difference between slurry blasting and wet abrasive blasting?
None in terms of the underlying process - they're different names used in different contexts for the same water-and-abrasive method. 'Wet abrasive blasting' is the term most often used in technical specifications; 'slurry blasting' is used more when the focus is specifically on the mixture itself.
Does the slurry need to be replaced during a job?
Not typically. A well-designed system recycles and monitors the slurry continuously, replenishing water and abrasive as needed rather than requiring a full changeover, which is what keeps the process consistent across a long production run.
What abrasive media is used in the slurry?
Media choice depends on the substrate and the finish required, and commonly includes glass bead, aluminium oxide, and other fine-grade abrasives suspended in water.