| 摘要 |
A spout-filling composition has from about 50% to about 70% by weight magnesium-aluminate spinel aggregate, from about 50% to about 30% by weight quartz sand, and lampblack in an additional amount of from about 0.25% to about 5.00% by weight of the magnesium-aluminate spinel aggregate and quartz sand admixture.
|
