Sites that are immediately dangerous to life and health (ie, irreparable and irreversible damage occurring within 30 minutes) and firefighters (or other personnel arriving in this area) who participate in rescue operations in the heart of a chemical accident To achieve Class A (asphyxiating or irritating toxicants, etc.) or Class B (non-volatile toxic solids or liquids) protection requirements, on-site rescuers for incidents of unknown sources must meet Class A requirements.
(A) Class A protection: It can provide the most complete protection for gases and liquids in the surrounding environment.
1. Protective objects: high vapor pressure, skin absorbable or carcinogenic and highly toxic chemicals; high concentrations of liquid splashing, contact, infiltration, and vapor exposure may occur; exposure to unknown chemicals (pure or mixture); hazards Concentration reaches IDLH concentration; lack of oxygen.
2. Equipment:
Full-face mask positive pressure air breathing apparatus (SCBA): determine the cylinder usage time according to capacity, user's lung capacity, activity, etc.;
Fully enclosed gas-tight chemical protective clothing: It is a gas-tight system that prevents the penetration of various chemical liquids and gases.
Protective gloves: chemical resistant gloves;
Protective boots: chemical-resistant boots;
helmet
(b) Class B protection:
The presence of toxic gases (or steam) or an environment that does not cause serious damage to the skin to pathogenic substances.
1. Protection object: It is a known gaseous toxic chemical substance that can absorb skin or respiratory tract, reach IDLH concentration, and lack of oxygen;
2. Equipment:
SCBA: determine the protection time;
Hooded chemical protective clothing: non-hermetic, anti-chemical liquid penetration;
Protective gloves: Chemical resistant gloves Protective boots: Chemical resistant boots
(c) Class C protection:
    Suitable for low-concentration pollution or on-site support operations.
1. Protective objects: Non-skin-absorbing toxicants; known types and concentrations of toxicants; concentrations lower than IDLH concentrations; no oxygen deficiency;
2. Equipment:
Air filter type respiratory protection products: positive pressure or negative pressure systems, selective air filtration, suitable for specific protection objects and hazard levels;
Hooded chemical protective clothing: isolated particles, a small amount of liquid splash;
Protective gloves: Anti-chemical liquid penetration Protective boots: Anti-chemical liquid penetration
(d) Class D respiratory protection:
1. Protection object: Suitable for people outside the cold or cold area.
2. Equipment:
Workwear or other common work clothes, boots and gloves attached to clothes.
China Labor Insurance Network
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