What Is E Glass?

Textile fibres are most often made of E glass, a special composition developed around 50 years ago for the production of individual fibres. It has excellent resistance to temperature changes and to attack by water, and is used as a reinforcing material in many applications. A typical composition would be: 54% SiO2; 14% Al203; 8% B203; 20% CaO, 3% MgO and 1% alkali (Na20+K20). Glass quality requirements are very high, as every seed and stone causes one fibre to break, and this may result in the necessity to restart a complete bushing comprising several hundred individual fibres. (whole item)