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Glass Fiber Types Glass fibers fall into two categories, low-cost general-purpose fibers and specialpurpose fibers. Over 90% of all glass fibers are general- purpose products. These fibers are known by the designation E-glass and are subject to ASTM specifications. E-glass fibers, whether employed for reinforcement, filtration, insulation, or other applications. The remaining glass fibers are special-purpose products. Many, like E-glass, have letter designations implying special properties. Specifically: Letter designation E, electrical S, strength C, chemical M, modulus A, alkali D, dielectric Property or characteristic Low electrical conductivity High strength High chemical durability High stiffness High alkali or soda lime glass Low dielectric constant. (Relation between stress and strain in composit e materials Table (11) abstract A composite material can be defined as a combination of two or more materials that results in better properties than those of the individual components used alone. The two constituents are a reinforcement and a matrix. The main advantages of composite materials are their high strength and stiffness, combined with low density. The reinforcing phase provides the strength and stiffness. In most cases, the reinforcement is harder, stronger, and stiffer than the matrix.