Polyimide -Feb tape BJ-CF polyimide film is the general Polyimide film that is coated or laminated on one or both sides with Teflon? FEP fluoropolymer. It imparts heat sealability, provides a moisture barrier, and enhances chemical resistance. Applications: require a heat bondable film, or moisture and chemical resistance beyond the capabilities of uncoated polyimide films, such as tubing, heater circuits, heat sealable bags, automotive diaphragms and manifolds, magnetic wire,PTC Insulation