Four indicators of non-woven inspection

Of course, because there is no clear standard, the engineers of Byrne summarized the past experience in mask testing and non-woven testing, and proposed several important testing indicators, namely filtration efficiency, respiratory resistance, hygiene indicators, and toxicology tests.





1. Filtration 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 for non-oily particles should not be less than 30%.


2. Respiratory resistance


Respiration 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.


3. 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, residual ethylene oxide, etc.


Four, toxicology test


The skin irritation test is mainly a protective test for people allergic to some materials. Refer to the regulations in GB15979. The skin irritation test of the mask non-woven fabric is mainly to cut a sample of a suitable area, soak it with normal saline, and stick it on the skin, and then cover it with a patch sticker for testing.