Patent ID: 11964900
Assignee: SAINT-GOBAIN CENTRE DE RECHERCHES ET D'ETUDES EUROPEEN
Field: Materials, metallurgy (Chemistry)
Classification: CPC C | IPC C

Claim 7:
8. Fused tuckstone according to claim 1, having a chemical composition in mass percentage based on oxides such that, for a total of 100%:
Al2O3+ZrO2+SiO2 is greater than 83.8% and less than 97.0%,
Y2O3 is greater than 0.5% and less than 5.0%,
Na2O is greater than 0.1% and less than 0.6%,
B2O3: more is greater than 0.1% and less than 0.6%, and
the amount of oxide types other than Al2O3, ZrO2, SiO2, Y2O3, Na2O and B2O3 is less than 10.0%.