鈣(CaO)>43.2%,矽(SiO2)>49.8%,鎂(MgO)<2.5%,燒失量<4%,白度>82,4-125μm
坯體(ti) 用矽灰石,鈣32-35%, 燒失4-10%,濕白25-70
鈣>32%,燒失量4-10%,燒後白度20-70
矽99.33%,鐵0.038%,鋁0.28%
矽45-51%,鈣41-46%