There are various kinds of dust masks, which must be selected according to different operational needs and working conditions. Firstly, it should be selected according to the concentration and toxicity of dust. According to GB/T 18664 "Selection, Use and Maintenance of Respiratory Protective Devices", as a half mask, all dust-proof masks are suitable for occupational exposure limits where the concentration of harmful substances does not exceed 10 times. Otherwise, full masks or respirators with higher protection level should be used. If particulate matter belongs to high toxic substances, carcinogens and radioactive substances, filter materials with the highest filtration efficiency should be selected. If particulate matter is oily, it is important to select suitable filter materials. If the particles are acicular fibers, such as slag asbestos, asbestos, glass fibers, etc., because the dust mask can not be washed, the face mask with micro-fibers is easy to cause facial irritation in the sealing part of the face, and is not suitable for use. [5]
In high temperature and humidity environment, it is more comfortable to choose the mask with exhaust valve. The mask with ozone removal can be used for welding to provide additional protection. However, if the ozone concentration is higher than 10 times the occupational health standard, the mask can be replaced, and the filter element with dust and poison can be combined. For those environments where there are no particulate matter but only some odors, it is much lighter to choose a dust mask with activated carbon layer than to wear a gas mask. For example, in some laboratory environments, because the national standards do not regulate the technical performance of such masks, it is better to try them out first to determine whether they can effectively filter odors.
Whether dust masks really play a protective role, in addition to the choice of protective function, another important choice factor is suitability. There is no universal design that fits everyone's face shape. At present, the certification test of dust masks does not guarantee that the masks are suitable for every specific user. If there is leakage, air pollutants will enter the respiratory area from the leakage site. The method of choosing a suitable mask is to use the suitability test. It uses the human taste and produces bitter or sweet particulate matter with special tools. If the taste can still be felt after wearing the mask, it indicates that there is leakage of the mask.
Hangzhou Demo Medical Technology Co.,Ltd
Address: Zhongce Garden,No.8 St, Hangzhou Eco And Tec Dev Zone, China
Tel: +86-571-87390575
Fax: +86-571-87390523
E-mail: info@demomedical.com
