Foundry Grade Bentonite: Specifications and Uses
Technical guide to foundry grade bentonite — specifications, applications in sand bonding, and quality parameters. By Radhe Enterprises Gujarat.
Foundry Grade Bentonite: Specifications and Uses
Bentonite is an essential additive in foundry operations. Here is a technical guide on foundry-grade specifications and applications.
Role of Bentonite in Foundry
In metal casting foundries, bentonite serves as a binder in green sand moulding: - Bonds sand particles to create stable moulds - Provides thermal stability during metal pouring - Allows moisture control in moulding sand - Enables reusability of moulding sand
Foundry Grade Specifications
Bentonite Red Ball Granules - Montmorillonite: >85% - Swelling Index: 24-30 ml/2g - Green Compression Strength: Excellent - Hot Strength: Good - Particle Size: 2-8 mm
Bentonite Powder (200-300 mesh) - Finer particle size for uniform distribution - Higher active surface area - Better bindability - Suitable for automated sand systems
How Bentonite Works in Sand Moulds
1. Bentonite is mixed with silica sand (typically 5-10% by weight) 2. Water is added to activate the bentonite 3. The mixture is compacted around a pattern 4. Bentonite swells and bonds sand grains together 5. The mould holds its shape during metal pouring 6. After casting, sand can be reclaimed and reused
Quality Parameters for Foundry
- Green Compression Strength: Should be >1.0 kg/cm2
- Moisture Content: 4-6% optimal in activated sand
- Loss on Ignition: <5% for clean castings
- Methylene Blue Value: Higher = better quality
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