According to that FAA document, PET (Polyethyleneterephthalate) is considerably less combustible than PE. This material seems to be BoPET (biaxially-oriented po

According to that FAA document, PET (Polyethyleneterephthalate) is considerably less combustible than PE. This material seems to be BoPET (biaxially-oriented polyethylene terephthalate), which is aluminised PET. Presumably less flammable than PET, but not included in the FAA document. I am not an expert, and haven't tested it. Edit: I see now, that PE seems to be in the doorway.