Dry grinding concrete is never safe without a HEPA dust extractor. Respirable crystalline silica (RCS) causes silicosis, and most countries (OSHA in the US, EU Silica Directive) legally require wet grinding or vacuum extraction. A shop vac without HEPA is not compliant.
Concrete contains quartz. When you grind it, the airborne dust contains particles smaller than 4 microns that bypass your nose and throat and lodge in the lungs. There is no cure for silicosis. Exposure limits are typically 0.05 mg/m3 over 8 hours.
| Method | Dust level | When to use |
|---|---|---|
| Dry grind + HEPA extractor | <0.1 mg/m3 | Indoor epoxy, polishing |
| Wet grind | Very low | Outdoor, roadwork, heavy stock removal |
| Open dry grind | Unsafe | Never without extraction |
Our double-S segment discs and R3 round-segment shoes are designed for use with standard vacuum shrouds.
Browse concrete grinding discs category for tools designed for dust-controlled grinding.
No. It does not filter the respirable fraction. You need a HEPA-rated extractor.
Less dangerous, but silica dust still blows around. Wet cutting is preferred outdoors.
OSHA PEL is 50 micrograms/m3 over 8 hours. Without extraction, you exceed this in minutes.
Dry grinding is a tooling choice, not a safety exemption. HEPA extraction and a P3 respirator are mandatory indoors. contact JOY TECH if you need tooling that pairs well with vacuum shrouds.
