For silica dust — Respirable Crystalline Silica (RCS) — you need an M-Class certified vacuum cleaner connected directly to the cutting, drilling or grinding tool. A standard vacuum cleaner is not a COSHH compliant engineering control for RCS, regardless of how powerful it is or what the marketing literature claims. The classification mark must appear on the machine.
Why silica dust is so dangerous
Silica is present in stone, concrete, brick, block, engineered stone, fibre cement and sandstone. When these materials are cut, ground, drilled or sanded, RCS particles are released — fine enough to penetrate deep into the lungs, impossible to expel, accumulating over time. The resulting disease is silicosis — irreversible, progressive and potentially fatal. There is no cure. The Workplace Exposure Limit for RCS is 0.1mg/m³ as an 8-hour time-weighted average — one of the lowest WELs in UK occupational health law. Dry cutting operations can exceed this within seconds of starting.
The HSE enforcement position
HSE conducted over 1,000 site inspections in 2026 specifically targeting RCS exposure from dry cutting. The enforcement position is clear: dry cutting of stone, concrete, block and brick without on-tool extraction or wet suppression is unacceptable practice. Prohibition notices — work stops immediately on the spot — are being issued. The enforcement programme is ongoing.
What makes a vacuum COSHH compliant for silica
Three requirements must all be met simultaneously:
- M-Class certification — the machine must carry the M-Class classification mark, tested as a complete unit to EN 60335-2-69. Minimum 99.9% filtration at 1 micron. A machine described as HEPA or fine dust rated without an M-Class mark does not satisfy the standard.
- Direct tool connection — the vacuum must be connected directly to the power tool through the tool's dust shroud or port. A vacuum placed nearby without a direct connection does not control RCS at source and does not satisfy COSHH.
- Documented in the COSHH assessment and method statement — the machine name, classification and connection method must be recorded. An HSE inspector will ask to see the COSHH assessment for the task.
110V or 240V for site use?
If your site mandates 110V — as most principal contractors do — you need a native 110V M-Class machine. A 240V machine on a step-up transformer is not accepted as site-safe on most sites. The V-TUF MINI HSV X2 and MIGHTY HSV are both available in native 110V and 240V.
What about floor grinding?
Floor grinding, scarifying and scabbling are among the highest-risk RCS exposure tasks. Concrete floors contain 25–50% silica and grinding generates sustained high concentrations of RCS. The same M-Class on-tool extraction requirement applies, but with higher airflow machines to handle the volume of dust generated. The MIGHTY XL HSV 37L and tufVAC PTO range are the specifications for floor preparation dust extraction.
- Silica dust control equipment →
- COSHH compliant extraction range →
- Floor grinding dust extraction guide →
- M-Class extraction hub →
- COSHH Regulations 2002 →
- HSE silica crackdown 2026 →
This article is for general guidance. Confirm your specific COSHH assessment requirements with a qualified occupational hygienist or safety adviser.
