N95 safety mask

valvelesshalf-maskadult

N95 respirator is one of nine NIOSH certified particle respirators. "N" means not resistant to oil. "95" means that the particle concentration in the mask is more than 95% lower than that outside the mask when exposed to a specified number of special test particles. 95% is not the average, but the minimum. N95 is not a specific product name. As long as the product meets N95 standard and passes NIOSH review, it can be called "N95 mask". The degree of protection is N95, which means that under the test conditions specified in NIOSH standard, the filtering efficiency of the filter material of the mask for non oily particles (such as dust, acid mist, paint mist, microorganism, etc.) reaches 95%. The filtration efficiency of N95 respirator for particles with aerodynamic diameter of 0.075 μ m ± 0.02 μ m is over 95%. The aerodynamic diameter of air bacteria and fungal spores mainly varied between 0.7-10 μ m, which was also within the protection range of N95 respirator. Therefore, N95 respirator can be used for respiratory protection of some particles, such as dust generated in the process of grinding, cleaning and handling minerals, flour and some other materials. It can also be used for liquid or non oil particles that do not produce harmful volatile gases due to spraying. It can effectively filter and purify the abnormal smell inhaled (except toxic gas), help reduce the exposure level of some inhalable microbial particles (such as mold, anthrax, tuberculosis, etc.), but it does not eliminate the risk of contact infection, disease or death.