Polymer long rod insulators, used in high voltage overhead power transmission lines, are lightweight, unbreakable, and hydrophobic, offering secure and reliable operation with good anti-vibration and moisture capabilities, and strong anti-pollution flashover ability.

Polymer insulators are 90 percent lighter than porcelain insulators and have higher strength. They are made of fibreglass rods and covered by polymer weather shelters. Silicon rubber, PTFE, EPM, and EPDM are some of the other materials utilised to make polymer insulators.