Fiberglass is the most common material used for commercial fiber reinforced polymer composites. Called glass or fiberglass, this material is processed in several different ways to form products with varying features:
- •E-Glass is the most inexpensive and commonly used fiber. The "E" designation stands for "electrical" because of its superior insulative properties. E-Glass has good fiber strength (~500 Ksi) and relatively low fiber modulus (~10.5 Msi).
- •S-Glass is a standard aerospace formulation of glass that is stronger (~600 Ksi) and higher modulus (~12.5 Msi) than E-glass. The "S" designation is for "strength," and is a trade name of Owens-Corning Inc. Other fiberglass manufacturers with comparable products use designation such as "T-glass" and "R-glass."