Contacts: Jacky Jiang
FAX: 0086 371 55951125
ADD: 51 Xiasha 22nd Street, Hangzhou, China
Mask Inspection And Maintenance
Mask testing standards
Except for the Japanese standard (0.06-0.1 μ m), the particle size of 0.3 μ m is used as the test standard. The flow rate of EU standard is 95L / min, and that of us standard is 85L / min. In China, the suspended particle size for national standard is more than 90% of less than 5 μ m, more than 70% of less than 2 μ m, and the flow rate is 42.5l/min. The idea of "the worst case" is adopted in the inspection and certification of filter materials, that is, the worst conditions are set up when the laboratory tests are carried out. For example, the calculated diameter of ammoniated sodium salt or DOP oil mist dust particle size of 0.3 μ m in efficiency test represents the size of extremely small particles that are most easily penetrated into the filter material, and represents the breathing volume when engaging in strong physical labor. Before the test, the filter material shall be pretreated with high temperature and high humidity, which represents the harsh working environment. All these aims are to test Under such harsh conditions, if the filter material can reach the corresponding efficiency level through detection, then it will be more effective in practical application to protect the health of workers. Generally, the anti- filter material uses activated carbon or chemically treated activated carbon as the material to filter the toxic gas or vapor through adsorption or chemical reaction without being inhaled.
- 1. cleaning. First, gently rub the gauze mask with warm water and soap. The bowl shaped mask can be gently cleaned with a soft brush dipped in detergent, and then washed with clean water. Please note that do not rub hard, because if the gap between warp and weft of gauze is too large, it will lose the function of preventing flying foam.
- 2. disinfection. Soak the cleaned mask in 2% Peracetic Acid Solution for 30 minutes or boil it in boiling water for 20 minutes or steam it in a steamer for 15 minutes, then dry it for standby. This method is suitable for gauze masks and bowl masks.
3. check. Before reuse, it is necessary to carefully check whether the mask and mask are still in good condition. For gauze mask and mask, light transmission inspection method can be adopted, i.e. take care of them before getting the lamp to see if there is any obvious light spot, and whether the light transmittance of the middle part and the edge part is the same. If there is any doubt, replace them with new ones. In any case, masks and masks should be renewed after 3 to 7 times of cleaning. Masks with excellent quality can be cleaned 10 times. The active carbon adsorption respirator should be replaced regularly. If the active carbon interlayer is not replaceable, it should be replaced after 7 to 14 days. This kind of respirator can not be reused after cleaning.