1) To compare with the porcelain or glass insulators, it has so many advantage:
High tear strength, excellent hydrophobicity and developed formula of silicone rubber can largely extend insulators`s service life.
Reliable and stable mechanical strength with end fitting sealed by high temperature
vulcanization silicone rubber ensure its safety operation.
2) Silicon rubber line post insulator-consists of a load-bearing cylindrical insulating solid core, a housing and end fittings attached to the insulating core, it is intended to be subjected to contilever ,tensile and compressive loads.
3) Core-internal insulating part of silicone rubber line post insulator, designed to ensure the mechanical characteristics. The core usually cosnsits of glass-fibers in a resin-based matrix.
4) Housing-external insulating part of silicone rubber line post insulator, providing necessary creepage distance and protecting core from environment. An intermediate sheath made of insulating material may be part of the housing.
5) Shed-protecting part of the housing intended to increses the creepage distance.
6) Interface-surface between different materials, such as between glass fiber with impregnating resin, core,housing,and fittings.
End fittings-device forming an intergral and permanent part of the insulator intended to connect it to a supporting structure or to conductor hardware. | 
