Strain type insulators are one of suspension insulators used in power industry for more than a century and are still the most widely used.

Strain type insulators are made from porcelain materials and generally glazed for marking the surface of insulator smooth. The glaze is chemically inert and therefore resists surface corrosion.

Strain type insulators made from glass were in used for telegraph lines even before were employed for power transmission lines. The main difficulty in using glass is that flaws in the surface often lead to fracture under stress. Processes like thermal tempering or toughening are carried out to improve the strength characteristics of glass material. These are often prone to vandalism.

Strain type insulators made from Non ceramic insulators are usually made up of silicone rubber, Poly-Tetra -Fluoro-Ethane(PTFE) or Ethyl Propylene Diene Monomer (EPDM) rubber. Non ceramic insulators consist of the following main parts:
◆ Fiberglass rod
◆ Silicone rubber housing
◆ Metallic end fitting hardware

Strain type insulators can be designed in 10kv, 11kv, 22kv, 33kv, 45kv, 69kv, 110kv, 220kv, 300kv, 400kv and 500kv.

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