Sand casting is a common method for producing non-ferrous alloy castings. The process was invented over 6,000 years ago and continues to be modernized. Sand casting sand types are wet sand, water glass or water glass or sodium silicate, resin sand.

More than 70% of the world's metal castings are produced through the sand casting process. Sand casting is efficient and cost-effective.

Types of sand used in sand casting
1. Green Sand
Green sand castings are formed using a sand mold formed from green sand, which contains water and an organic binding compound, also known as clay. The term "green sand" means that the sand does not "set," "green," or "unset" when the metal is poured into the mold. Because sand can be reused, casting sand from wet sand is simple and inexpensive. The downside is that sand is a soft mold and can collapse or shift during casting.

2. Water glass or sodium silicate
Sodium silicate can be used to make sand castings. This process is beneficial in sand casting where cavities are required. Carbon dioxide can be rapidly changed from liquid to solid by passing carbon dioxide through sodium silicate. This results in dehydration of the sodium silicate. Sodium silicate must be mixed with other materials in order to remove the core during product decomposition. If the mixture is not correct, the core will get stuck inside the casting.

3. Resin sand
The modeling material of resin sand casting is a mixture of quartz sand and resin sand. When resin sand is mixed and heated, it hardens into a strong, smooth mold. Stronger molds produce fewer defective castings, but are more expensive and slower to produce. Resin sand molds take longer to make because each has to be mixed and fired individually.