Protective objects: protection from high vapor pressure, absorption through the skin, or carcinogenic and highly toxic chemicals; high concentrations of liquid spills, contact, infiltration and vapour exposure; exposure to unknown chemicals (pure or mixture); Achieve IDLH concentration, lack of oxygen.
equipment:
Full faceted positive air breathing apparatus (SCBA): Determine the cylinder usage time based on capacity, user's vital capacity, activity, etc.;
Fully enclosed airtight chemical protective clothing: airtight system, anti-all kinds of chemical liquid, gas penetration;
Protective gloves: chemical resistant gloves;
Protective boots: chemical protective boots;
helmet
Class B protection: In toxic gases (or steam), it is an environment where the pathogenic substances are not harmful to the skin.
Protective object: It is a known gaseous toxic chemical substance, which can absorb skin or respiratory tract, reach IDLH concentration, and lack oxygen;
equipment:
SCBA: Determine the guard time;
Headgear chemical protective clothing: non-hermetic, chemical liquid penetration;
Protective gloves: chemical resistant gloves
Protective boots: chemical protective boots
helmet
Class C protection: suitable for low concentration polluted environment or on-site support work area
Protective object: non-skin absorbs toxic substances, the type and concentration of poisons are known, the concentration is lower than the concentration of IDLH, and there is no lack of oxygen;
equipment:
Air-filtered respiratory protection products: positive or negative pressure systems, selective air filtration, suitable for specific protective objects and hazard levels;
Headgear chemical protective clothing: isolated particles, a small amount of liquid splashing;
Protective gloves: anti-chemical liquid penetration
Protective boots: anti-chemical liquid penetration
Class D respiratory protection:
Protective object: suitable for people in the cold area or outside the cold area
equipment:
Work clothes or other common overalls, boots and gloves connected to the pants;
Firefighters (or other personnel coming to the area) who are in immediate danger to life and health (ie, irreparable and irreversible hazards that occur within 30 minutes) and those who participate in the rescue center of the 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 of unidentified sources must meet Class A requirements.
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