Protection level of chemical protective clothing
Release time：
2021-01-29
Class A protective clothing refers to heavy-duty positive pressure isolation protective clothing. The oxygen supply system can provide more than one hour of breathing. The penetration rate of common biochemical reagents is less than 0.01 per cent within one hour. It refers to the protective clothing with the highest protective ability, airtight protective clothing, which should be trained before use, airtight tests should be done regularly, and cleaned after each use.
Class A protective clothing refers to heavy-duty positive pressure isolation protective clothing. The oxygen supply system can provide more than one hour of breathing. The penetration rate of common biochemical reagents is less than 0.01 per cent within one hour. It refers to the protective clothing with the highest protective ability, airtight protective clothing, which should be trained before use, airtight tests should be done regularly, and cleaned after each use.
In 1990, additional standards were proposed and developed by the National Fire Protection Association (NFPA) and the American Society for Testing and Materials (ASTM) and accepted by OSHA. NFPA1991 Standard e sets out performance requirements for airtight and chemical protective clothing, which include chemical and flame resistance tests, and can resist 21 basic chemicals. The basic OSHA standard for chemical protective clothing requires four levels of protection.
Level A,B,C, and D. Workers at each hazard level must be equipped with corresponding levels of protective equipment and protective clothing to fully protect users.
Level A- Indicates the maximum level of hazard that can result from a person's breath, eyes, or skin injury that can result from toxic vapors, gases, particulates, chemical splashes, immersion, or exposure to toxic materials. It requires fully enclosed protective clothing, which must be equipped with SCBA or line breathing apparatus and appropriate accessories. Level A chemical suits can also be made to meet NFPA1991 standards. Level B indicates that the environment requires the highest respiratory protection, but the requirements for skin protection are not high. It requires SCBA or positive pressure line respirator with escape cylinder, plus hood,
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