Masks Common Sense
NIOSH is divided into three series according to the lipophilicity of materials: N (protection of non-oily suspended particles); R (protection of non-oily suspended particles and sweat suspended particles, 8 hours time limit); P (protection of non-oily suspended particles and sweat suspended particles, no time limit).
2, according to the filtration of each series of materials is divided into 95 (95%), 99 (99%), 100 (99.97%) three. As a result, a total of nine kinds of masks. Such as the common N95, N99 and so on.
3, because the air in the microbial particles are non-oily particles, so we prevent the daily dust and bacteria or anti-virus anti-influenza virus masks can be used N class. The N95-type mask means that the energy efficiency of 95% of the filter, N99 filter energy efficiency of 99%.
4, mask type N-class structure is composed of three layers: the most lining layer of polyester acupuncture cloth, the middle layer is the melt-blown filter, the outermost layer is generally PP spunbonded cloth, and some also add Layer of activated carbon.
5. Mask in daily use, can be divided into activated carbon masks and air filter masks. Activated carbon because of its characteristics are irregular structure, and the material is composed of tiny honeycomb, the main use of his adsorption function to filter impurities dust. Filter of the mask is the most widely used in daily, material is generally cotton, non-woven texture. 3 yuan, 5 yuan masks generally poor filtration, can not achieve effective protection, in the choice, we have to look at a simple description and material composition, such as look at the number of layers and filter energy efficiency. The use of masks should not be long-term wear, the use of 2-3 hours should be replaced, timely cleaning and disinfection to prevent dust on the mask after the filter, the breeding of bacteria, saliva secondary pollution.