Testing method for overall air tightness of chemical protective clothing

Chemical protective clothing, also known as chemical protective clothing, is protective clothing worn to protect oneself from chemical hazards or corrosive substances. Can cover the whole or most of the human body, at least can provide protection to the torso, arms or thighs. Chemical protective clothing is allowed to be a combination of multiple pieces of clothing with protective functions, and can also be used in conjunction with other protective equipment.

In response to emergencies, investigation, rescue, disinfection, disposal of toxic waste, production of chemical substances, agricultural pesticides, medical treatment, spraying and other work, it can effectively protect the human body, so the protective performance of protective clothing is very important. It is very important for users. The country recently promulgated the national standard "GB 24539-2021 Protective Clothing - Summary of Test Items for Chemical Protective Clothing", which stipulates various properties and test methods of protective clothing. The standard will come into effect on September 1, 2022.

According to the protective performance and requirements, there are many kinds of chemical protective clothing. This article introduces the national standard requirements and test methods of airtight chemical protective clothing.

Gas-tight chemical protective clothing: a single-piece chemical protective clothing with a hood, windows, and hand and foot protection. When matched with suitable respiratory protective equipment, it can protect against a higher level of toxic and harmful chemicals (gas, liquid, and solid particles) ).

Overall air tightness (air tightness) performance requirements

According to the provisions of 6.4 in the national standard GB 24539-2021, the overall air tightness test is carried out on the airtight chemical protective clothing and the airtight chemical protective clothing-ET, and the pressure drop within 4 minutes should not exceed 20% of the test pressure. Test Methods:

Before the overall performance test of chemical protective clothing, it should be pretreated according to the standard requirements. Temperature and humidity pretreatment, wear experiment, etc.

est environment conditions: All performance tests should be carried out at (20±2)°C and relative humidity (65±4)%.

Carry out in accordance with the provisions of Appendix A of the national standard GB 24539-2021. Principle: After inflating the airtight chemical protective clothing, after a certain period of time, the airtightness of the clothing can be determined by checking the pressure drop in the clothing.