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 ...

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 ...

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.