| 摘要 |
The instant invention relates to a novel dental glaze which matures at a temperature of from 1400 DEG to 1600 DEG F, that is, at least 200 DEG lower than the vitrifying temperature of dental porcelain. The chemical composition of this novel glaze may be thusly represented, on a weight basis: }SiO2 45-52% }B2O3 15-20% }Al2O3 10-15% }K2O 3.5-7.5% }Na2O 12-17% }CaO 0-1% }ZnO 0-1% }F 1-3% } Preferably the instant novel glaze is further characterized as having an average particle size of 10 +/- 4 microns and not more than 1% of the particles having a diameter greater than 30 microns. |
