This kind of heat insulation consists of AL / EPE/AL,etc multi- layers of obstruction material.It is an environment friendly product which has good heat preservation and insulation properties.Each layer of the product has good function on abrasion and tearing resistance.The middle layer (EPE) shows strong ability in moisture barrier, oxygen reduction and sound insulation.The outer layer (aluminum foil) also has the advantages like reflecting light and heat and preventing the damages caused by ultraviolet radiation