Gas mask and its selection principle

- Oct 30, 2019-

In industrial enterprises, gas masks are the basic means of operator breathing protection. Its main function is to prevent harmful substances in the air from entering the body from the laborer's respiratory tract. Especially in emergency places such as highly toxic operations, equipment maintenance, accident rescue, lack of oxygen and escape, gas masks have a unique role in ensuring the safety and health of operators.

At present, the varieties of gas masks developed and produced in China can generally meet the needs of operators for respiratory protection under various conditions.

There are many types of gas masks, the structure is complex, the requirements are strict, and it is directly related to the safety of users. Therefore, the wearer should have some understanding of the performance of various gas masks, so that the selection is reasonable and the operation is ready quickly to fully exert its protective effect.

Gas masks are commonly known as respirators. They are structured in different ways. There are generally two ways to classify them.

First, according to the purpose, it can be divided into three categories: anti-virus, dust-proof and oxygen supply. Second, according to the principle of action, it can be divided into two types: filter type (purification type) and isolation type (supply type).

1. Filter gas mask: The function of the filter gas mask is to filter out the toxic substances in the air that the human body inhales, so that the wearer can absorb the clean gas that meets the national sanitary standards. This is a widely used, portable and effective protective gear. However, it must be noted that they can only be used in places where there is no oxygen deficiency (ie, the oxygen content in the air is not less than 18%) and the concentration of the poison is in a certain range. Filter gas masks are available in both ducted and direct versions. The main components are masks and canisters. The mask is divided into a full face mask and a half mask, and is available in different models.

The anti-toxic charcoal used to protect the poison vapor in the filter gas mask. Anti-toxic charcoal is made of activated carbon. Activated carbon is impregnated on the pore surface of activated carbon by chemical agents such as copper, silver, and chromium metal oxide.

Its protective effect on poison steam is:

1. Physical adsorption of capillary

2. Chemical changes in the reaction of chemical agents with poisons on charcoal

3. The oxygen and water in the air react with the poison under the catalytic action of the chemical agent on the charcoal.