国产精品亚洲专区一区|亚洲中文字幕成人在线|无码播放的一区二区视频|人妻无码a∨在线一二三|亚洲福利视频一区二区三区|国产亚洲精品自在久久77|提供最新的在線欧美综合一区|久久AV高潮AV无码AV喷吹

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.