Sand casting commonly utilizes a few distinct types of sand, primarily differentiated by their composition and binder systems.
Common Types of Sand Used in Sand Casting
Based on common practices in sand casting, the sand molds are created using specific mixes to achieve the required properties for holding molten metal. According to the MetalTek International blog, there are three common types of sand used in this process:
- Green Sand: This type refers to sand that is uncured or essentially raw. Its name isn't indicative of its color but its state before hardening.
- Water Glass or Sodium Silicate: This type uses a binder based on sodium silicate.
- Furan Resin Sand: This type utilizes a furan resin binder.
These different types offer varying mold properties, such as strength, permeability, and surface finish, which are crucial for successfully casting different metals and part geometries.
To summarize the types:
| Sand Type | Primary Characteristic (Based on Reference) |
|---|---|
| Green Sand | Uncured or essentially raw |
| Water Glass | Also known as Sodium Silicate |
| Furan Resin Sand | Uses a furan resin binder |
Each type is selected based on the specific requirements of the casting process, including the metal being poured, the size and complexity of the part, and desired production volume.
