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E-Glass or electrical grade glass was originally developed as an insulator for electrical wiring. It was later found to have excellent forming capabilities and is now used almost exclusively as the reinforcing phase in the material commonly known as fibreglass (also spelt fiberglass). Woven glass fabric is a lightweight, strong, and robust material. Although strength properties are somewhat lower than carbon fiber and it is less stiff, the material is typically far less brittle, and the raw materials are much less expensive. Note that woven fibreglass is much finer than woven roving, which is a heavier glass cloth, often used for boat building in conjunction with CSM as a simple means of adding bulk to increase stiffness. E-glass is the common, all-purpose reinforcement while S2-glass (high-Strength), is stronger, stiffer and far more expensive. Compared to E-glass, S-glass provides about 40% higher tensile and flexural strengths, about 10 to 20% higher compressive strength and flexural modulus, and greater abrasion resistance. Due to its cost, S2 glass has mostly been superseded by carbon fibre.

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