Formaldehyde (MDF & Composite Boards) COSHH assessment
MDF, chipboard and other composite boards are bonded with formaldehyde resins. Cutting and sanding them releases both wood dust and formaldehyde, a respiratory irritant and recognised carcinogen.
The hazards
- Formaldehyde released when cutting, routing and sanding composite boards
- A respiratory sensitiser and recognised carcinogen
- Fine dust that also carries the wood-dust hazard
- Vapour can build up in enclosed, warm areas
Who is at risk
Exposure routes
- Inhalation of dust and vapour
- Skin and eye contact
Health effects
- Eye, nose and throat irritation
- Occupational asthma
- Recognised carcinogen with long-term exposure
- Dermatitis
Control measures (hierarchy of control)
Controls should be applied in order — eliminate or substitute first, then engineering controls, then PPE as the last line.
- On-tool extraction (LEV) fitted to saws, routers and sanders
- Fixed LEV at workshop machines and good general ventilation
- Vacuum with an M-class vacuum, never dry-sweep or use compressed air
- Limit exposure time and the number of people exposed
- RPE for short tasks where LEV cannot fully control exposure
PPE & RPE
- FFP3 mask (face-fit tested)
- Eye protection
- Ear defenders (machining noise)
First aid
- Move to fresh air if breathing is affected
- Rinse eyes with clean water
- Health surveillance for asthma is required for regular exposure
Workplace exposure limit (WEL)
Relevant legislation & guidance
Formaldehyde (MDF & Composite Boards) COSHH FAQs
It carries the same wood-dust risks plus formaldehyde from the resin binder, which is a respiratory sensitiser and carcinogen. That is why on-tool extraction and FFP3 protection matter when cutting or sanding MDF.
2 ppm over 8 hours and as a 15-minute short-term limit. Because formaldehyde is carcinogenic, keep exposure as low as reasonably practicable with extraction and RPE.
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