Protection film, building aluminum profile protection plastic is a blue protection tape or scratch resistant tape which serves to protect the aluminum profile surface, when loading aluminum profile into the truck car, shipping, delivery and installation / installation. Nowadays coating technology is increasingly sophisticated, aluminum profile surfaces can be coated with resin to have natural wood fiber patterns, or natural bamboo patterns. This blue Protection film function is very useful to protect the aluminum profile coating surface, this blue film protection is very suitable to protect the surface of the construction panel, composite panel, steel plate, metal plate, stainless steel plate, and household devices. thus preventing scratches and abrasions, and ensuring the aluminum profile installed is a new frame, not a used frame.