莫來石,矽51.39%,鈣0.28%,鐵0.31%,鋁40.13%,鎂0.79%,燒減6.60%
鋁54%,鋁矽比5.1,硫7%
氧化好,白度好,低鐵,陶瓷料
①鋁35%,白度45
②鋁39%,白度50
③鋁18%,白度60
鋁50%±5%,矽13%±3%,鐵20%±3%