insulating materials: aluminum, copper, PVC, PET, kraft paper, sponge jacket, pearl cotton jacket. The main technical ... , 3M, EVA, high foam.2, insulating materials: aluminum, copper, PVC, PET, kraft paper, sponge jacket, pearl cotton jacket.3, glue products ... the glue used in the product.4, dust-proof material: Camera cotton, cotton filters, dust filters, anti-free cloth.