久久精品国完整版在线播放,丰满多水的寡妇互动交流,欧美久久精品久久99 ,{国内精品久久久久久影院_当漂亮人妻当夫面被强了电影_教练的大东西_魏大勋把杨幂做哭天涯

The specific gravity of zinc oxide after high-temperature calcination (calcination temperature at 1250 degrees Celsius, Xinfengrun firing curve) will increase to 2.0 to 2.5. The use of glaze in the glaze is good, no thixotropic, no pinhole, can increase the speed of the kiln High yield bricks. Zinc oxide that is not calcined or whose calcining temperature is not enough and whose specific gravity is not enough will affect the process performance of the glaze and reduce the production stability.