GRP / Fibreglass Resin (polyester resin & MEKP catalyst)
COSHH assessment
A COSHH assessment for grp / fibreglass resin (polyester resin & mekp catalyst) 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
Styrene vapour, IARC Group 2A carcinogen, CNS effects, respiratory and eye irritation. WEL 100 ppm STEL. MEKP catalyst, strongly oxidising, eye damage, fire risk on contact with promoters/skin. Glass fibre, see COSHH-015.
Routes of exposure
Inhalation, Skin contact, Eye contact, Fire
Control measures
- Outdoor or ventilated work only, confined-space work requires forced ventilation and airfed RPE.
- Pre-promoted resins to avoid catalyst handling where possible.
- Catalyst stored away from accelerator and in cool, ventilated cabinet.
- No hot work within 6m.
- Air monitoring for styrene against WEL.
PPE for what is left
- A2 organic vapour half-mask (airfed in confined spaces), Nitrile gloves, Splash goggles, Disposable coveralls, FR overalls if hot work nearby
Emergency procedures
- Inhalation: fresh air, A&E if persistent.
- Skin: soap and water.
- Eyes: irrigate 20 mins, A&E.
- MEKP eye splash: irrigate 20 mins minimum, urgent A&E.
- Catalyst fire: dry powder, evacuate.
Questions people ask
Do I need a COSHH assessment for grp / fibreglass resin (polyester resin & mekp catalyst)?
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. For this substance: WEL 100 ppm STEL.
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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