Views:1 Author:Site Editor Publish Time: 2020-12-14 Origin:Site
Of course, since there is no clear standard, Zibo Dongmai is here to summarize the past experience in mask testing and non-woven product testing, and propose 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 of mask quality assessment. 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
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.
3. health indicators
Health indicators are naturally another important key indicator of non-woven masks. Here we recommend testing items mainly including initial contaminating bacteria, total bacterial colonies, coliform bacteria, pathogenic pyogenic bacteria, total fungal colonies, Escherichia coli, Staphylococcus aureus, Candida albicans, residual ethylene oxide, etc.
4. toxicology test
The skin irritation test mainly considers the protective test test for people allergic to some materials. Refer to the regulations in GB 15979. 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 paste it on the skin, and then cover it with a patch sticker for testing.