The outer jacket of loop lead-in cable is typically made of:

The outer jacket of loop lead-in cable is typically made of polyethylene because this material provides excellent durability and resistance to moisture, chemicals, and various environmental conditions. Polyethylene is lightweight, flexible, and has good electrical insulation properties, making it ideal for use in applications where the cable might be exposed to outdoor elements or interference.

Unlike rubber, which can degrade over time when exposed to UV light and may not provide the same level of moisture resistance, polyethylene maintains its integrity and performance over extended periods. Vinyl, while also used in some cable applications, does not have the same level of resistance to extreme temperatures and environmental factors as polyethylene. Fiberglass, on the other hand, is not practical for the outer jacketing of cables and is primarily used for reinforcing other materials, not for protecting communication cables in this context. Thus, polyethylene stands out as the most suitable choice for loop lead-in cable jackets, ensuring reliable performance in various installations.