Specific to the mask, its raw material is polypropylene (PP), and medical masks are generally multi-layered, generally referred to as SMS structure.
Little knowledge of chemistry
Polypropylene: Polypropylene, abbreviated as PP, is a colorless, odorless, non-toxic and translucent solid substance, which is a polymer formed by addition polymerization of propylene. The molecular formula is -[CH2CH(CH3)]n-. Polypropylene is widely used in the production of clothing, blankets and other fiber products, medical equipment, automobiles, bicycles, parts, transportation pipelines, chemical containers and so on. It is also used for the packaging of food and medicine.