Low-dielectric-constant glass fiber and glass fiber fabric made thereof

   
   

Low-dielectric-constant glass fibers having a glass composition comprising, by weight %, 50 to 60% of SiO.sub.2, 10 to 18% of Al.sub.2 O.sub.3, 14% to less than 20% of B.sub.2 O.sub.3, 1% to less than 6% of MgO, 2 to 5% of CaO, 0.5 to 5% of TiO.sub.2, 0 to 0.3% of Li.sub.2 O, 0 to 0.3% of Na.sub.2 O, 0 to 0.5% of K.sub.2 O and 0 to 2% of F.sub.2, the content of MgO+CaO being 4 to 11% and the content of Li.sub.2 O+Na.sub.2 O+K.sub.2 O being 0 to 0.6%. The glass fiber has a low dielectric constant and a low dielectric tangent, is excellent in productivity and workability and is also excellent in water resistance, and the glass fiber is suitable for reinforcing printed wiring boards for high-density circuits.

fibras de cristal Bajo-diele'ctrico-constantes que tienen una composición de cristal el abarcar, por el peso %, 50 a el 60% de SiO.sub.2, 10 a el 18% de Al.sub.2 O.sub.3, el 14% menos al de 20% de B.sub.2 O.sub.3, el 1% menos al de 6% de MgO, 2 a el 5% de CaO, 0.5 a el 5% de TiO.sub.2, 0 a 0.3% de Li.sub.2 O, 0 a 0.3% de Na.sub.2 O, 0 a 0.5% de K.sub.2 O y 0 a el 2% de F.sub.2, el contenido de MgO+CaO que es 4 a el 11% y el contenido de Li.sub.2 O+Na.sub.2 O+K.sub.2 O que es 0 a 0.6%. La fibra de cristal tiene una constante dieléctrica baja y una tangente dieléctrica baja, es excelente en productividad y workability y es también excelente en resistencia de agua, y la fibra de cristal es conveniente para reforzar las placas de circuito impresas para los circuitos de alta densidad.

 
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