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U.S. standards for protective clothing

According to the different types of standard chemical protective clothing, China is divided into: heavy and light protective clothing, the United States has four ABCD standards, and Europe has 1-6 levels.


Class A airtight protective clothing


1. General requirements: need to be used in conjunction with air breathing apparatus, chemical protection boots and gloves.

2. Main application:

When the highest level of respiratory and skin hazards exist at the same time, and when used in unknown hazardous environments.

Class A protective clothing can resist almost all hazardous chemicals (including gas, liquid or solid) and any hazardous substances in industrial production.

Class A air-tight protective clothing is known as the strongest chemical protective clothing in the world. The whole set of clothing must be equipped with a positive pressure air respirator or a long tube air respirator to achieve air tightness.


This type of protective clothing must be tested regularly for air tightness to ensure safety in use.


isolation suit


Class B sealed protective clothing


1. General requirements: need to be used in conjunction with air breathing apparatus, chemical protection boots and gloves.

2. Main application:

When the highest level of respiratory hazard and lower level of skin hazard exist simultaneously.

Equipped when it is known to have no effect on the skin or penetration, and only pose a threat to the respiratory system.


Class B protective clothing requires the respiratory protection level to reach A level, and the skin protection level is relatively lower than A level, which can prevent the penetration of liquid substances, but cannot prevent the penetration of harmful vapors or gases.

This type of protective clothing mainly focuses on the protection of liquid toxic substances, rather than gaseous toxic substances.


Class C spray protective clothing


1. General requirements: generally need to be used in conjunction with filtered air breathing equipment, chemical protective boots and gloves.

2. Main application:

When a lower respiratory hazard and a lower-level skin hazard exist simultaneously.

It is equipped when it is known that it has no effect on the skin, and the composition and concentration of toxic substances in the environment are known.


Class C protective clothing has the same level of skin protection as Class B protective clothing, but the respiratory protection level is relatively lower than Class B. It can prevent the ejection of toxic liquid substances, but cannot protect against toxic vapors or gaseous substances.


isolation suit


Class D splash protective clothing


1. General requirements: It is suitable for general working environment, and has the primary protective effect on harmful dust and chemical reagents that users may come into contact with.

2. Main application:

Dust protection, a small amount of low-concentration chemical liquid splashing.


Class D protective clothing, low-level protective clothing, does not have protective performance on the skin and respiratory system.

Equipped in a known gaseous environment, harmless to the human body and no liquid splashing.


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