Radiation protection clothing, also known as electromagnetic radiation shielding clothing, is made of metal fiber and textile fiber, and the manufacturing process is more complica
Jul 22, 2021
Masks are divided into medical masks and non-medical masks, (and the latest confirmed) civilian sanitary masks.
Jul 21, 2021
For the filter material of a good protective mask, the following three conditions should be met. One is that the filter efficiency is high when the mask is in good contact with the
Jul 20, 2021