The Bureau of Indian Standards under the health ministry issues guidelines for face mask standards, mainly focussing on N95 about specific raw materials like non-woven polypropylene, which helps ...

Common face mask annoyances and solutions for how to ... CDC's recommendation of multiple layers of fabric, vinyl is a non-woven material that is often used in hospital settings and is not porous.

Non-woven masks which passed filtering performance tests had a 100-percent leakage rate when not worn properly. Worn correctly, the leakage rate dropped to about 50 percent. “How to choose face ...