PURPOSE: To provide a board for a circuit which is strengthened by glass fiber to be easily made to fibers with high dielectric constant and containing composition of excellent chemical durability and has excellent dielectric characteristics.
CONSTITUTION: A board for a circuit comprises high dielectric constant glass fiber 1 containing inorganic dielectric particles 4 dispersed in resin 2 to be strengthened in such a manner that the fiber 1 contains 40 to 65mol% of SiO2, 20 to 45mol% of at least one of MgO, CaO, SrO and BaO, 5 to 25mol% of at least one of TiO2 and ZrO2, and 0.1 to 15mol% of NbO5/2. The board is formed of glass composition containing total quantity of oxide of 85mol% or more and having fiber like suitability of specific dielectric constant (1MHz, 25°C) 9 or more in such a manner that the resin is fluororesin.
KOMORI KIYOTAKA
YAMAKAWA SEISHIRO
HIRATA ISAO
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