Sample Collection, Analysis, and Respirator Use With Isocyanate Paints

This report was written in response to questions from field operations which indicated problems with regard to the health effects and respiratory protection required for isocyanate paints. Personnel sample results were not in keeping with observed levels of exposure in spray operations. Not all isocyanate toxicity is the result of sensitization. Often, the acute irritative effects of isocyanates are confused with those caused by sensitization. Sensitization occurs in 10 of users in most reports. The outside figure is 20. The isocyanate moiety is not the only sensitizer in isocyanate paints. The paints may also contain amines and phenol derivatives which can be potent sensitizers. Current sampling and analytical methods for isocyanate do not reflect the environment when spray guns are in use. The majority of the isocyanate is missed. As currently accomplished these do not account for the isocyanate in the aerosol. The use of air supplied respirators as the most effective protective measure is discussed. Keywords Foams Mists Spray painting Vapors Isocyanates Respirators Test and evaluation.