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1970's - 1980's custom fit helmet liners.

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Thru out my career in Life Support I was assigned duties making the custom fit foam liners for aircrew helmets. The chemicals contained isocyanates. ( Same as the early spray foam insulation for building construction. ) The aircrew members had limited exposure, but the LS tech's were exposed to 2 to 5 or more pours in a day. Biomedical always claimed the was no hazard.

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