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Medical mask
Product performance structure and composition: This product is made of nonwovens and high efficiency filter materials. Protective masks include dust masks, protective masks, gas masks, etc. according to the structure and principle of action, they can be divided into two categories: filter type and isolation type respiratory protectors. Filter type respirator: it takes the wearer's own breathing as the power to filter and purify the harmful substances in the air. It is suitable for places where the concentration of harmful substances in the air is not high and the oxygen content in the air is not less than 18%. There are two types of mechanical filtration and chemical filtration. Isolation (air supply) type respiratory protective device: the air inhaled by this kind of respiratory protective device is not the purified site air, but is supplied separately. According to its gas supply mode, it can be divided into two types: self-contained type and external input type. In case of emergency, if there is no gas mask or special protective mask, we can also use easily available materials to make simple respiratory protective equipment, such as flat mask, absorbent cotton mask, towel mask, triangular towel mask, cotton gauze mask and dust mask. In addition, the skin needs to be protected to prevent harmful microorganisms from invading the body through the skin. The commonly used methods are to wear isolation type anti-virus clothing or anti epidemic clothing and wear protective glasses. The scope of protective masks the standard of protective masks specifies the basic requirements, test methods, identification, operation instructions, packaging, transportation and storage of medical protective masks (hereinafter referred to as masks). This standard is applicable to the self-priming filtering dust-proof medical protective mask which can filter the particles in the air and block the harmful gas droplets, blood, body fluids, secretions, etc. 2 normative references the clauses in the following documents become the clauses of this standard through the reference of this standard. For dated references, all subsequent amendments (excluding corrigenda) or revisions are not applicable to this standard. However, parties to agreements based on this standard are encouraged to study whether new versions of these documents can be used. For undated references, the new edition is applicable to this standard.
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