Weathersheds for polymer insulators are manufactured from materials such as bisphenol or cycloaliphatic epoxy resins, thermoplastic rubber, and ethylene-propylene diene monomer (EPDM) and silicone elastomers.


These materials are compounded with various types of inorganic fillers such as silica and hydrated alumina with concentrations ranging form a few percent to 70% by weight.
Today, the elastomeric materials of EPDM and silicone containing a minimum of 70% by weight of hydrated alumina that are in use by most of manufacturers are favored for weathersheds with silicone rubber clearly showing the best performance over all other types. Failures of some first generation polymer insulators with epoxy resin weathersheds have been attributed to depolymerization by hydrolysis. Depolymerization refers to the destruction of the molecular structure of polymer materials. Hydrolysis is the result of a chemical reaction, which takes place between the ions of water and the free ends of polymer chemical chain, which causes depolymerization to occur.
Insulators made from epoxy resins contain locked-in mechanical stresses that develop during curing of the resin. This occurs when mixing or curing of the resin is uneven. Circumferential cracks between sheds sometimes develop during storage of the insulator because of the locked-in stresses.

Weathersheds for insulators are useful in transmission and distribution system.


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