Is polypropylene flame retardant?
There are flame retardant grades of polypropylene available. These have various UL ratings. They are more expensive and, because of the addition of the flame retardant fillers, they have lower physical properties and fabricating qualities. Allegheny has developed HY-PRO flame retardant clad copolymer polypropylene. This material has two outside skin sheets of flame retardant polypropylene that are coextruded onto a center core of copolymer polypropylene. Thus providing a composite that is a tough material with flame retardant exterior surfaces.
