First, the level of toxic hazard level

A poison:

Benzene, nickel carbonyl, mercury and its compounds, arsenic and its compounds (other than non-carcinogenic inorganic arsenides), manganese and its compounds, chromates, dichromates, bituminous tobacco,

The second type of poison:

Chlorine, acrylonitrile, hydrogen sulfide, styrene, carbon tetrachloride, carbon disulfide, formaldehyde, lead and its compounds, cadmium and its compounds, carbon monoxide, aniline, nickel metal, acrylamide, furfural, chloroform, hydrogen cyanide, paraphenylene Diphenols, vanadium pentoxide, hydrazine hydrate

Three poisons:

Toluene, xylene, methanol, nitric acid, sulfuric acid, hydrochloric acid, dimethylformamide, phenol, cresol, nitrogen oxides, trichloroethylene, sulfur dioxide, pyridine, monoethanolamine, sodium thiocyanate, acetonitrile, ammonium nitrate, two Ethanolamine, sodium nitrite, perchloric acid, methylamine, crotonaldehyde (2 -crotonaldehyde ) , formic acid, isobutanol, triphenylphosphine, hydrofluoric acid, ethylenediamine, tail gas

Four types of poisons:

Solvent gasoline, acetone, sodium hydroxide, ammonia, polypropylene, vinyl acetate, 2- butanone, sulfur, cyclohexane, butylene, butadiene, propionaldehyde, acetic acid, acetaldehyde, carbon dioxide, butanol, B Diol, naphtha, butyraldehyde, isobutyraldehyde, methyl tert-butyl ether, liquefied petroleum gas ( propane, propylene, butane, butylene, etc. ) , ethyl acetate, isopropanol, hexane, isoprene Alkane, tetrahydrofuran, n-heptane, titanium tetrachloride, ethylbenzene

Second, the introduction of protective clothing level

The American Fire Protection Association ( NFPA ) NFPA1991 standard classifies protective equipment into four levels.

1 , A -level protection:

The highest level of breathing, skin and eye protection available.

Provide breathing gas (SCBA or gas pipeline ) ; Fully enclosed chemical protective clothing ; Inner and outer layers of chemical protective gloves; Chemical protective boots ;

A-class heavy chemical protective clothing

The following conditions must be worn:

Measured ( or possibly ) the presence of high concentrations of steam, gases, and dust; it is highly likely to be accidentally splashed, immersed or exposed to steam, gas, and dust, causing damage to the skin or absorption through the skin;

There may be substances that are highly injurious to the skin, and it is impossible to avoid contact with the skin at the same time; the operating environment is poorly ventilated and requires Class A protection.

2 , B level protection

Class B protection is similar to class A for respiratory protection, less skin protection, and minimum protection level when handling dangerous goods.

Provide breathing gas (SCBA or gas pipeline ) :

Anti-chemical, splash-proof clothing; inner and outer layers of chemical protective gloves; chemical protective boots; hard hat.

The following conditions must be worn: IDLH environment ( inhalation only ) does not cause serious skin damage, or does not meet the conditions for making filters; substances with known contact properties and concentrations require high respiratory protection, low skin protection, low oxygen concentration At 19.5% ; gas that cannot be completely detected by the instrument, but is harmless to the skin or not absorbed through the skin.

3 , Class C protection

Full-facepiece air-filter respirator ; chemical protective clothing; inner and outer layers of chemical protective gloves; chemical protective boots;

Full face mask gas mask

Wear Class C protective clothing in the following situations :

The types and concentrations of contaminants in the air are known, and the filter can effectively filter; oxygen is not lower than 19.5% ; lower than the IDLH gas environment.

Class D protection

No respiratory protection, minimum skin protection:

Coveralls; chemical protective gloves; chemical protective boots; safety glasses or goggles;

Wear the following conditions:

There are no known harmful gases in the atmosphere; there is no liquid splashing, immersion in liquids, or exposure to any harmful chemicals.

The information in this article comes from the Internet and was reorganized and edited by China Rescue Equipment Network.