Isocyanate Exposure (Spray Foam and Coatings)

Talking points

1. Isocyanates are found in spray polyurethane foam (SPF), two-component coatings, and some adhesives. They are one of the leading causes of occupational asthma.
2. Once sensitized to isocyanates, even extremely low exposures — far below the PEL — trigger asthma attacks. Sensitization is permanent and can be career-ending.
3. Full-face supplied-air respirators are typically required during SPF application. Half-face APRs with organic vapor cartridges may be sufficient for small-scale work — check the SDS.
4. Skin contact is also a sensitization route. Wear full-body protective clothing including chemical-resistant gloves, coveralls, and a hood during spray operations.
5. Building occupants and other trades must be excluded from the spray area and cannot re-enter until the space has been ventilated and off-gassing has dropped to safe levels — typically 24 hours minimum.

Ask the crew

Is anyone applying spray foam or isocyanate-containing coatings today — and have adjacent work areas been cleared?

Standards this talk is built on

• 29 CFR 1910.1200
• 29 CFR 1926.55

A toolbox talk is a short safety briefing. It supports the training a standard requires; it does not replace it.

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