3 types of sand casting from jiachuancasting's blog

For more than half a century, Ermak has been mastering and perfecting the art of sand casting. 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. There are three types of sand for casting: wet sand, water glass or water glass or sodium silicate and resin sand.

Sand Casting Sand TypesSand Casting Sand Types

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 must be mixed and fired individually.