1.It is 22M Mullite Sand. 2.It is made in Wellchina Guangdong of CHINA. 3.It is used in precision casting. 1.The  22M  Mullite Sand  is  made by kaolin clay.2.It is used  for stuccoing  in precision  casting ...

1.This is 80-120M zircon sand. 2.It is used in inner layer for shell-making. 3.It is used in investment casting. 1.The  80-120M  zircon sand  is  used  in  investment  casting, the processing is called dipping.2.It  can...