This item consists of AL/EPE/AL multi-layers of obstruction material.It is an environment friendly product which has good heat preservation and insulation properties.The middle layer of EPE/AL shows strong ability in barrier of moisture and oxygen,reduction and insulation of sound.The middle layer also has the advantages like reflecting light and heat and stopping the penetration of ultraviolet radiation. Property: 1. It has no nocuous substance and accord with the standards of ISO14000.It also does not generate any pollutant bringing harm to people's health when being installed and in use. 2. It is a high quality material for warm-keeping and energu-saving,which is the killer of dew froming and the transmission of cold and heat.. It insulates any heat media with a stable and low thermal conductivity. 3. It's light in weight.It could absorb sound,reduce noise,and provide cushioning function.