Polymer Strain Insulators, also referred to as polymer long rod insulators, emerged as an alternative to porcelain insulators in the 1920s, primarily for challenging environments like high-pollution areas. Their construction includes a fiber-reinforced core, metal fittings, and a silicone housing.
Notably, these insulators benefit from the manufacturing advantages of FRP (fiber-reinforced plastic) rods, which can be produced in exceptionally long lengths, up to 20 meters. They find utility in various network systems, with lengths ranging from 10 centimeters to over 10 meters, making them versatile for different electrical infrastructure needs.