The products are made of cotton which dipped into the phenolic aldehyde resin then heat pressed by mould. With high mechanical properties and processing properties. Heat-resisting grade is E. It is Suitable for electrical equipment of insulation structure parts and transformer.

According to the properties, they can be divided into three kinds 3721, 3723, 3725, 3721 is better than 3723 in mechanical strength. 3723is an economical product versus 3721, 3725Similar to NEMA grade LE.

Technic Requirement
Guise --smooth, no air bubble, no oil stain& impurity, allow have inequality color, scrap, a little not level which does not interferethe usage. Diameter exceed 25mm, allow have crack which does not interferethe usage.