What is a key characteristic of polyethylene when exposed to high temperatures?

Polyethylene is a thermoplastic polymer, and its behavior under high temperatures is significant for safety considerations, particularly in fire service situations. When exposed to high temperatures, polyethylene does not maintain its physical form; instead, it begins to soften and ultimately liquefies. This liquefaction can lead to the material dripping or running, which creates additional hazards, such as spreading flames. Moreover, the liquefied polyethylene can ignite, contributing to fire spread and increasing the intensity of a fire.

Understanding this characteristic is crucial for firefighters and building inspectors, as it influences how polyethylene-based materials are handled in emergencies and in building construction. Polyethylene’s tendency to liquefy and ignite under heat makes it important to consider when assessing the fire risks associated with structures that contain this material.