Patent ID: 11964909
Assignee: SCHOTT AG
Field: Materials, metallurgy (Chemistry)
Classification: CPC C | IPC C

Claim 10:
11. A sealing glass comprising:
SiO2 having a content of at least 45% by weight;
Al2O3 having a content of less than 2% by weight;
Na2O having a content of not more than 5% by weight;
free of PbO except for unavoidable impurities;
a coefficient of linear thermal expansion (α20-300) of more than 10*10−6/K;
a dielectric constant (εr) in the range from at least 7.10 to not more than 7.80 at a measurement frequency of 1 MHz and a temperature of 25° C.;
a glass transition temperature (Tg) in a range from 400 to 550° C.;
CaO having a content of greater than 0% by weight to not more than 15% by weight; and
ZnO having a content of greater than 0% by weight to not more than 8% by weight.