What do the terms ‘e-glass’ and ‘s-glass’ refer to?

Fiberglass fabric is economical and easy to produce.  It is made up of small strands of glass stretched into small fibers. Another name is  ‘e-glass,' or electrical grade.


S-glass uses a different and more expensive chemical formula in the molten glass. It is much stiffer and stronger that e-glass. It is an excellent choice for those who want increased strength, but do not want to pay a premium for carbon fiber.

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