When the heat-shrinkable waterproof cap can also be called waterproof end cap, it is also used for insulation corrosion, corrosion mainly used in both ends of the pipe foam insulation jacket, connect the outer jacket and inner tube, pipe insulation in the transport, storage and use play sealed waterproof anti-corrosion effect. Shrinkable waterproof cap is a polyethylene material by high energy ionizing radiation treatment, the appearance of the cap, after expanding by polyethylene pipe forming a layer of hot melt adhesive laminating film made waterproof thermal cap has high mechanical strength aging resistance, resistance to environmental stress cracking, good sealing performance characteristics, have a long service life, the product is suitable for a variety of polyurethane foam insulation and waterproof protection ends. 1. waterproof caps will shrink in the pipe ends, remove the foam and rust powder to ST3 level, where there is oil applied gauze wipe clean. 2. The bulk of overlap with jacket waterproof thermal wool cap, clean fight. 3. The steel wool jacket and fight preheat section. (Without affecting the original coating case preheat temperature should reach 50 ℃). 4. waterproof caps will shrink into a heater for heat shrink 5. Flashing not circumferentially uniform bulk thermal shrinkage until hot melt adhesive overflow. (Such as high temperatures, small head, slip when heated, can be used wet towel covered above). 6. shrinkable waterproof cap ends (with foam attached office) shall be overheating. 7. heat shrinkable waterproof cap head to the hot melt adhesive overflow. When the contraction is complete, with the pressure on the flashing stick rolling again. 8. After completion of construction should be no bubbles, no obvious surface carbonization and folds, all edges with adhesive overflow, bonding firm.