TE Connectivity’s (TE) Dual-Wall, Flame-Retardant, Halogen-Free (DWHF) Heat Shrink Tubing offers a 3:1 shrink ratio and meets the high requirements of the rail industry EN 4554 standard. The inner adhesive layer melts during installation to form a seal, with the underlying substrate preventing the ingress of corrosion, moisture, and connectivity issues. DWHF tubing can be installed using a hot air gun or other standard application tooling equipment. TE DWHF Tubing is suitable for various environments, including rail, marine, mining, transportation, and oil and gas.