... of its raw material is polypropylene, and the plastic bags' raw material is polyethylene, although the two materials'name is similar, but they ... Range Available Specification1. Light: Polypropylene is the main raw material; specific gravity is 0.9, is only third five, fleecy and ... , non-irritating: made of materials which catch up FDA standard, without other chemical composition, stable, non-toxic, no ...