Patent ID: 9701567
Date: 2017-07-11
CPC Classifications: C03C,Y02E

Claim:
1. A glass comprising, in mol %: 70-77 SiO 4.5-10.5 Al >0-5 B 3-5 MgO >0-5 CaO 0-5 SrO 1.8-11.8 Na 0-3 ZnO 0-6 K 3<R′O≦12, and 7≦R wherein R′O=MgO+CaO+SrO+BaO, R 2 O=Na 2 O+K 2 O, the glass has a Na release greater than 10 ppm in a buffered aqueous release test, a total Na+K release of less than 30 ppm in a buffered aqueous release test, a T margin =T breakdown −T 35kp >10° C., and a strain point greater than 565° C.