The heat shrink method of cable manufacturers is suitable for sealing  medium and low voltage rubber,plastic cable connector and terminal, also can apply to non-trickle and viscous dipping insulated cables.

Usually using heat shrink tubing made from crosslinked polyethylene and silicone rubber , which can be shrink uniformly after heat.

Cover the tubing on the part need to connect and sealing, then coated with a layer hot melt adhesive on the part. Second, use a heater to heat the tube, when get its shrink temprature, it star shrinking. meanwhile, the adhesive will melt. It becom a perfect sealing coat after cooling.