Proper use of dust masks and matters needing attention
In the environment of high temperature, high humidity, choose a valved respirator will be more comfortable, can choose ozone removing mask for welding can provide additional protection, but if the ozone concentration is 10 times higher than the standard of occupation health can be replaced with masks, dust, toxic combination of filter elements. The particle does not exist, but only some peculiar environment, choose anti-dust masks with activated carbon layer than wearing a mask to light more, such as certain laboratory environment, but because of the national standard does not this kind of masks for technical performance specifications, best choice of trial, judge whether really can effectively filter the smell.
There are a wide range of dust masks, which must be tailored to different operating requirements and working conditions. First of all, according to the concentration and toxicity of dust. According to GB/T18664 "respiratory protective equipment selection, use and maintenance", as the half mask, all anti-dust masks are suitable for harmful concentration of not more than 10 times the occupation contact limiting value environment, otherwise you should use full cover or protection grade higher respirator. If the particles are high toxic substances, carcinogens and radioactive materials, filter materials with the highest filtration efficiency shall be selected. If the particles are oily, be sure to choose the applicable filter material. If the particles were needle like fibers, such as asbestos, slag wool, glass fiber, because anti-dust masks can not be washed, micro fiber sticking on facial masks in the sealing parts caused by facial stimulation, is not suitable for use.
Whether the respirator is really protective or not, in addition to the protective function, another important factor is suitability. There is no universal design for all people's faces. At present, the certification of dust masks does not guarantee that masks are suitable for each specific user. If there is a leak, air pollutants will enter the respiratory zone from the leak. Choose a suitable method is to use a mask for the fit test, which uses people's taste, particles with special tools have bitter or sweet, if you still can feel the taste of wearing masks, masks that leak, please introduce the fitness test reference GB/T18664.
