LOW DIELECTRIC GLASS FIBER

摘要

A glass fiber having a low dielectric constant and low dielectric loss tangent consists essentially of by weight, as a glass composition, 52 to 60 % of SiO₂, 11 to 16 % of Al₂O₃, 20 to 30 % of B₂O₃, and 4 to 8 % of CaO, and substantially no MgO, substantially no Li₂O, substantially no Na₂O, substantially no K₂O, and substantially no Ti₂O. The glass fiber also may contain up to 2 % F₂ by weight. The glass fiber is ideal for use as reinforcement for printed wiring boards, and has excellent dielectric properties at frequencies of about 18 GHz or higher.