The door panel can be made of color steel plate, stainless steel plate, aluminum plate, etc., the frame material is made of hot-dip galvanized cold-formed profile, the door panel is filled with high-density flame-retardant polyurethane foam material or fireproof rock wool board, and the surface of the door panel is treated with rib stripe technology (to increase the strength and beautiful appearance of the door panel). High-quality hardware fittings (special hardware, rails, hinges, etc. according to the selected profiles). All selected accessories shall be rustproof (galvanized, sprayed and oxidized);