Patent ID: 8685873

Claim:
A lithium-aluminosilicate glass, which can be converted with glazing times of under 2.5 hours into a transparent glass ceramic with high-quartz mixed crystals as the prevailing crystal phase, which transparent glass ceramic has a turbidity of less than 1% according to ASTM D 1003 and has a neutral color shade, and a content in % by weight based on oxide of: Li 2 O 3.0-4.5 Na 2 O 0-1.5 K 2 O 0-1.5 Î£Na 2 O + K 2 O 0.2-2.0 MgO 0-2.0 CaO 0-1.5 SrO 0-1.5 BaO 0-2.5 ZnO 0-2.5 B 2 O 3 0-1.0 Al 2 O 3 19-25 SiO 2 55-69 TiO 2 1.4-2.7 ZrO 2 1.3-2.5 SnO 2 0-0.4 Î£SnO 2 + TiO 2 <2.7 P 2 O 5 0-3.0 Nd 2 O 3 0.01-0.4. CoO, in an amount greater than 0 to up to 40 ppm optionally with additions of chemical refining agents As 2 O 3 , Sb 2 O 3 or CeO 2 or refining additives sulfate, chloride or fluoride compounds in total contents of up to 2.0% by weight.