Bentonite clay used in casting is mainly used in clay bonded sand, because the bentonite has strong bonding, high plasticity, good stripping, breathable excellent, high temperature and humidity conditions, stable physical and chemical properties.

Bentonite clay for foundry is mainly composed of sodium bentonite and calcium bentonite.

sodium bentonite is made from natural sodium bentonite or artificial sodium bentonite. The bentonite is welcomed by the foundry industry because of its good reusability and high wet compressive strength. . Because of good plasticity, it can stop casting sand, scar, block, sand-type landslides and other phenomena, combined with strong molding, cavity strength, easy to mold the metal industry wet or dry die, precision casting is preferred Molding sand binder.

Calcium bentonite is made from natural calcium-sodium bentonite and is the sand binder widely used in light casting. It is practical and easy sand casting by the users.

Bentonite clay has an important feature is that it has a certain heat capacity. As long as the heating temperature is not too high, remove the free water bentonite as long as the water, still able to restore the ability to stick.