This product is made of EPDM rubber and special resin, processed by special technology and a new kind of heat shrinkable product. After heating, the inner diameter of the sleeve shrinks rapidly to half, and the protected electronic component is tightly wrapped in the casing without being influenced by the external environment. Compared with the ordinary three yuan ethylene propylene rubber tube, the product is crosslinked by the electron accelerator and has the advantages of better physical and mechanical performance, higher voltage resistance grade and good abrasion resistance