Bentonite is used in foundry casting sand because it acts as an excellent binder that helps molding sand hold its shape during metal casting. When mixed with water, Bentonite becomes sticky and provides the strength needed to form solid, smooth molds for molten metal.
How Bentonite Helps in Foundry Applications
1. Strong Binding Strength
Bentonite binds sand particles together, allowing the mold to stay firm and stable while pouring hot molten metal.
2. Better Mold Shape & Smooth Finish
It helps create detailed and accurate mold shapes, which improves the surface finish of the final cast product.
3. High Thermal Stability
During casting, molten metal reaches very high temperatures. Bentonite withstands heat and prevents mold cracking or breaking.
4. Good Reusability
Sand mixed with Bentonite can be recycled and reused many times, reducing production costs.
5. Improves Green Strength
In green sand molding, moisture in Bentonite provides necessary flexibility and wet strength, so molds do not collapse under pressure.
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