Raychem ATUM is a black semi-flexible Heat Shrink Tubing made of adhesive-lined polyolefin with dual wall. This ATUM-series Heat Shrink Tubing features 4:1 shrink ratio allow for connector-to-cable sealing. Tubing and adhesive remain flexible, so the moisture-seal withstands bending. The adhesive in ATUM tubing bonds to a wide variety of plastics, rubbers, metals and also polyethylene, aluminium, steel and copper. High expansion ratio makes it possible to repair most damaged cable jackets without removing connectors. It is radiation-cross-linked and adhesive-lined to provide environmental sealing in a wide variety of electrical applications such as sealing connector back shells and cable breakouts and to repair damaged cable.