Patent ID: 7517822

Claim:
A borosilicate glass, having a coefficient of thermal expansion α 20/300 of between 3.4×10 −6 /K and 4.86×10 −6 /K and a composition, in percent by weight based on oxide content of: SiO 2 55-80 B 2 O 3 8-25 Al 2 O 3 0.5-10 Li 2 O + Na 2 O + K 2 O 1-16 MgO + CaO + SrO + BaO 0-6 ZnO 0.6-3 Bi 2 O 3 0-2.0 MoO 3 0-1.20 with Bi 2 O 3 + MoO 3 0.01-2.0; and which is free of ZrO 2 .