矽≥52.75%,鐵≤0.16%,鈣≥38.51%,鋁1.15%左右,鎂3.66%左右,鉀0.03%左右,鈉0.03%左右,鈦0.0%左右,1200℃下燒後白度≥84.4,灼減≤3.50%
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%