Spray Foam and Isocyanate Exposure
29 CFR 1910.1200 · 29 CFR 1910.134 · This talk in Spanish
Why it matters
Spray polyurethane foam is two chemicals reacting in the air in front of your face, and the A-side, isocyanates, is one of the leading causes of occupational asthma. Sensitization is the trap: after enough exposure your body flips a switch, and then even trace amounts trigger attacks, ending careers. The mist travels far beyond the spray gun. Today: who needs to be in the spray zone, and what everyone in it wears.
Hazards
- ⚠ Isocyanate mist inhaled during spraying and for hours after
- ⚠ Sensitization leading to permanent occupational asthma
- ⚠ Skin and eye contact with A-side chemical and fresh foam
- ⚠ Other trades wandering into the spray zone unprotected
- ⚠ Off-gassing in poorly ventilated spaces after application
- ⚠ Heat from thick foam passes and trimming fresh foam
Controls and safe practices
- ✓ Only essential, protected workers in the spray zone; post it and keep other trades out during and after spraying per the product re-entry time.
- ✓ Sprayers wear supplied-air or the respiratory protection the SDS and program require; a dust mask does nothing here.
- ✓ Full skin coverage for spray crews: coveralls, gloves, eye protection against mist.
- ✓ Ventilate during and after: exhaust fans running through the re-occupancy period.
- ✓ Read the SDS before the first lift; know the symptoms: tight chest, wheezing, flu-like feeling after exposure.
- ✓ Report breathing symptoms immediately; early sensitization signs decide whether you keep this trade.
- ✓ No hot work near fresh foam; it is combustible until cured and protected.
Crew discussion questions
- When is spraying scheduled, and how are other trades kept out?
- What is the re-entry time for the product we use?
- What respiratory protection do our sprayers actually wear?
- Has anyone felt chest tightness after foam days? Say it now, not after it is permanent.
Applicable OSHA standards
29 CFR 1910.1200, 29 CFR 1910.134
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