Optic Fiber Heat Shrink Tube is a vital component used to safeguard fiber optic splicing elements. Heat shrink tubing is a versatile plastic layer which can be applied to cabling and components for several purposes by electricians, engineers and similar professionals, including: They are also known as heat shrink sleeves, in particular when used with cables. The name refers to the fact that the. Heat shrink tubing provides electrical insulation, mechanical protection, environmental sealing, and strain relief. Fiber optic cables transmit video, voice, and telemetry communication with light pulses. A specially designed cross-linked.