Agy Holding Corporation

Douglas S Boessneck

J Ronald Gonterman

Oleg A Prokhorenko

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 SiO, 11 to 16% of AlO, 20 to 30% of BO, and 4 to 8% of CaO, and substantially no MgO, substantially no LiO, substantially no NaO, substantially no KO, and substantially no TiO. The glass fiber also may contain up to 2% Fby 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.

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Aiken, SC, United States of America

Douglas S Boessneck