Premium quality Sodium Bentonite (Montmorillonite-based clay) supplied as natural lumps (crushed & screened) for various industrial applications.
Sodium Bentonite is known for its excellent swelling properties and water absorption capacity, making it ideal for foundry moulding sand, oil & water well drilling, civil engineering, pond lining, waterproofing, and iron ore pelletization.
| Grade | Form | Applications |
|---|---|---|
| Foundry Grade | Natural Lumps (Crushed & Screened) | Foundry moulding sand binder for metal casting industries. |
| Drilling Grade | Natural Lumps (Crushed & Screened) | Oil & water well drilling mud preparation. |
| Civil Engineering Grade | Natural Lumps (Crushed & Screened) | Civil engineering, piling, and foundation works. |
| Waterproofing Grade | Natural Lumps (Crushed & Screened) | Pond lining, waterproofing, and sealing applications. |
| Pelletization Grade | Natural Lumps (Crushed & Screened) | Iron ore pelletization in steel industry. |
Sodium Bentonite is a naturally occurring montmorillonite-based clay with exceptional swelling and absorption properties. Our bentonite lumps are crushed and screened to meet various industrial requirements.
| Material | Sodium Bentonite (Montmorillonite-based clay) |
| Form | Natural Lumps (Crushed & Screened) |
| Color | Off-white to light grey |
| Specific Gravity | 2.3 – 2.6 |
| Moisture Content | 8 – 12% |
HDPE bags / PP bags / Jumbo bags
| SiO₂ | Al₂O₃ | Na₂O | MgO | Fe₂O₃ | LOI |
|---|---|---|---|---|---|
| 55–65% | 15–22% | 2.0–4.5% | 2–4% | 2–4% | 10–14% |
| Specific Gravity | 2.3 – 2.6 |
| Moisture Content | 8 – 12% |
| pH (10% slurry) | 8.5 – 10.5 |
| Free Swell Index | 24 – 35 ml/2g |
| Water Absorption | 300 – 600% |
Quality checks and documentation to support consistent supply
We follow standard checks to ensure consistent quality and compliance.
Quality, reliability, transparency, and customer support in every shipment.
Any test reports can be shared on request at an additional cost, including third-party testing where required.
Premium grade bentonite suitable for foundry, drilling, civil engineering, and industrial applications.
Common questions about Sodium Bentonite Lumps
Sodium Bentonite is a naturally occurring, montmorillonite-based clay known for its high swelling capacity, water absorption, and sealing properties. It is widely used in foundry, drilling, civil engineering, waterproofing, pond lining, and iron ore pelletization applications.
Sodium Bentonite Lumps are commonly used for foundry moulding sand, oil and water well drilling, pond lining, civil engineering, waterproofing, and iron ore pelletization. Their high swelling and water-retention properties make them suitable for applications requiring binding, sealing, or fluid-loss control.
Sodium Bentonite is used for waterproofing because it absorbs water and swells significantly, forming a dense, low-permeability barrier. This makes it useful for pond lining, containment systems, foundations, and other sealing applications.
Sodium Bentonite has excellent swelling, viscosity, and water-retention properties, which help create drilling fluids that support borehole stability and assist in controlling fluid loss. It is commonly used in oil, gas, and water well drilling.
Yes. Sodium Bentonite Lumps can be used for pond lining because they swell when hydrated and can create a low-permeability sealing layer that helps reduce water seepage.
The primary difference is the physical form. Sodium Bentonite Lumps are supplied as crushed and screened natural pieces, while Bentonite Powder is processed into a finer particle size. The appropriate form depends on the application, handling requirements, and processing method.
Yes. Sodium Bentonite is widely used as a binder in foundry moulding sand. Its swelling and binding properties help improve mould strength and cohesion when properly mixed with foundry sand.
Sodium Bentonite acts as a binder during iron ore pelletization. It helps fine iron ore particles bind together, improving the strength and handling characteristics of green pellets and supporting the pellet production process.
Sodium Bentonite Lumps are naturally occurring, Montmorillonite-based clay minerals known for their high swelling capacity, superior water absorption, and excellent binding properties. Supplied as natural lumps that are crushed and screened, this premium-quality sodium bentonite is widely used across multiple industries where sealing, bonding, and permeability control are critical.
Due to its ability to expand significantly when hydrated, Sodium Bentonite forms a low-permeability barrier, making it an ideal material for foundry moulding sand, oil and water well drilling, civil engineering works, pond lining, waterproofing systems, and iron ore pelletization.
These properties make Sodium Bentonite an effective natural solution for sealing, stabilizing, and binding applications.
Sodium Bentonite is widely used as a binder in moulding sand, improving green strength, mould stability, surface finish, and resistance to erosion during metal casting.
In drilling applications, Sodium Bentonite acts as a key drilling fluid additive, helping to:
Used in cutoff walls, diaphragm walls, foundations, and tunneling, Sodium Bentonite provides effective seepage control and ground stabilization in large-scale infrastructure projects.
Thanks to its swelling and sealing properties, Sodium Bentonite is ideal for pond lining, canals, reservoirs, landfills, and waterproofing systems, forming an impermeable barrier against water leakage.
In iron ore processing, Sodium Bentonite serves as a binding agent that improves pellet strength, durability, and handling during transportation and processing.
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