The basic characteristic of green sand casting is that sand mold (core) does not need drying and there is no hardening process. Its main advantages are high production flexibility, high productivity, short production cycle, easy to organize flow production, easy to achieve production process mechanization and automation; Low material cost; Save drying equipment, fuel, electricity and workshop production area; Extended the sand box service life and so on.
The green sand for the casting molds usually has a mixture of:
Sand = 75-85%
Bentonite Clay = 5-11%
Water = 2-4%
Other materials = 3-5%