Curing Compounds (resin-based & wax-based)
COSHH assessment
A COSHH assessment for curing compounds (resin-based & wax-based) on a UK construction site: what it does to people, how it gets into them, the controls that stop it, the PPE for what is left, and what to do when it goes wrong. Copy it into your assessment and change what does not fit your job.
Hazards to health
Solvent-based variants, see COSHH-005. Water-based variants, generally lower hazard but spray mist inhalation. Wax-based, slip hazard until cured.
Routes of exposure
Inhalation (spray mist), Skin contact, Eye contact, Slip
Control measures
- Water-based products preferred.
- Apply by low-pressure airless spray or roller.
- Outdoor application minimises vapour exposure.
- Cordoned off until cured (slip risk).
- No hot work within 6m of solvent-based.
PPE for what is left
- A2P3 half-mask if solvent-based spray (FFP3 for water-based), Nitrile gloves, Splash goggles, Antistatic footwear if solvent
Emergency procedures
- Skin: soap and water.
- Eyes: irrigate 15 mins.
- Inhalation: fresh air.
Questions people ask
Do I need a COSHH assessment for curing compounds (resin-based & wax-based)?
If the substance is hazardous to health and your work exposes people to it, yes. The Control of Substances Hazardous to Health Regulations 2002, regulation 6, require a suitable and sufficient assessment before the work starts, with the significant findings recorded if you employ five or more. The safety data sheet is an input to the assessment, not a substitute for it. Guidance, not legal advice.
What is the difference between a safety data sheet and a COSHH assessment?
The data sheet is the manufacturer describing the product in general. The assessment is you describing how your people use it on your job: how much, how often, for how long, in what ventilation, with what controls. Two firms using the same tin can have very different assessments.
What is a WEL?
A Workplace Exposure Limit, the maximum airborne concentration averaged over a reference period, set in HSE document EH40. Where one applies to this substance it is stated in the hazards above; where it does not, the duty to reduce exposure so far as is reasonably practicable still stands.
Is PPE enough?
No. COSHH puts PPE last: eliminate the substance, substitute for something less harmful, control at source with ventilation and enclosure, then organise the work to reduce exposure, and only then PPE for what is left. An assessment that jumps straight to gloves and a mask is the kind an inspector questions. Guidance, not legal advice.
How often should it be reviewed?
When the product, the method, the quantities or the people change, if there is any sign the controls are not working, and at least every year or so regardless. Health surveillance may be required where exposure could cause an identifiable disease, such as dermatitis or occupational asthma.
The COSHH assessment writes itself
Pick the substance in the SiteLynx RAMS editor and the COSHH assessment fills in with the hazards, controls and PPE, alongside the HAVS and noise assessments for the tools you chose. Signed on site on a phone. 14 days free.
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