And what is the purpose of acid washing? we are going to conduct a research of role of boron in oil palm growth. the pH of sand material chosen for the study is around
Water glass investment casting process uses water glass quartz sand as the molding material, which can stand temperature up to 1800 degree, but it is more expensive than wet clay sand. 3. Silica sol investment casting process uses silica sol zircon sand as the molding material, which .