One. Filter efficiency
As we all know, filtration efficiency is a key indicator for the quality evaluation of masks. This is also one of the important quality standards of non-woven fabrics, so referring to relevant standards, we recommend that the bacteria filtration efficiency of mask non-woven fabrics should not be less than 95%, and the particle filtration efficiency should not be less than 30% for non-oily particles.
Second, breathing resistance
Respiratory resistance is the size of the influence that hinders breathing when people wear a mask. Therefore, the breathing resistance of the mask non-woven fabric determines the breathing comfort when wearing the mask. The index we recommend here is that the inhalation resistance should be ≤350Pa , and the expiration resistance should be ≤250Pa .
Three. Sanitary indicators
Sanitary indicators are naturally another important key indicator of non-woven masks. Here we recommend testing items mainly including initial contaminating bacteria, total bacterial colonies, coliforms, pathogenic pyogenic bacteria, total fungal colonies, Escherichia coli, Staphylococcus aureus, Candida albicans, residues of ethylene oxide, etc.
Four. Toxicology test
Skin irritation test , mainly considering the protective test test for people allergic to some materials. Refer to the regulations in GB 15979. The skin irritation test of mask non-woven fabrics is mainly to cut samples of a suitable area by cross sectioning, soak them in saline and stick them on the skin, and then cover them with patch stickers for testing.