Who invented the heat shrinkable tube and when?

1959, A.Charlesby and his student Pinner jointly published the first patent on radiation crosslinked heat shrinkable materials for his company Raychem, in which "Charlesby-Pinner relationship" was put forward.

Heat shrinkable sleeve is a special polyolefin heat shrinkable sleeve, which can also be called EVA. The outer layer is made of high-quality soft cross-linked polyolefin material and the inner layer is made of hot melt adhesive. The outer layer material has the characteristics of insulation, corrosion resistance and wear resistance, and the inner layer has the advantages of low melting point and high adhesion of waterproof sealing box.