Establishing Safe Criteria for Wearing Level B Chemical Vapo
Establishing Safe Criteria for Wearing Level B Chemical Vapor Protective Clothing While Working in Atmospheres of Less than 15,000 PPM of Ammonia Vapor (2014)-The original limitations placed on using Level B chemical vapor protective clothing for emergencies involving ammonia vapor were created by an OSHA Interpretation letter written by an OSHA regional director in 1991. The original criteria established a 5,000 PPM limit on Level B chemical protective equipment. The Ammonia Safety and Training Institute (ASTI) has evaluated current chemical vapor protective equipment through live ammonia testing and recommends that the original 5,000 PPM limit be increased to 15,000 PPM for Level B chemical vapor protective clothing that meets degradation, penetration, and permeation standards described within this Technical Paper.
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