The XFFR-30X4 is a halogen-free, flame-retardant heat-shrinkable tubing used for cable repair and protection. This tubing has a minimum expanded diameter of 76.20 mm (3.000 in) and recovers to a maximum diameter of 31.75 mm (1.250 in) after heating, achieving a nominal wall thickness of 4.06 mm. It operates within a temperature range of -55°C to 110°C and is resistant to moisture, fungus, and weathering. Because it emits minimal toxic or acid gases during combustion, it is ideal for use in enclosed areas like mass transit vehicles, ships, and buildings where a flame-retardant, halogen-free environment is required.