Sodium Bentonite Clay Bulk for Sale

Sodium bentonite is a naturally occurring swelling clay composed primarily of montmorillonite. When dispersed in water, its platelets separate and absorb large volumes of liquid, forming a gel with high viscosity and low permeability. These characteristics make it suitable for sealing, binding, and thickening applications across several industries.

Chemical Composition

The primary active component is sodium montmorillonite, typically representing 70‑90 % of the dry mass. Minor constituents include quartz, feldspar, and calcite, which influence abrasiveness and settling behavior. The sodium exchange capacity determines the extent of swelling; higher Na⁺ content yields greater hydration.

Typical Physical Properties

Bulk density, moisture content, and swelling index vary with source material and processing. The values below represent common ranges for commercially available sodium bentonite supplied in bulk form.

Key Applications

The swelling and sealing ability of sodium bentonite creates a low‑permeability barrier when hydrated. This property is exploited in civil engineering for pond liners, landfill caps, and tunnel grouting. In foundry work, the clay acts as a binder for molding sand, providing green strength and collapsibility after pouring. Additionally, its thixotropic nature makes it useful as a viscosifier in drilling fluids, helping to suspend cuttings and control fluid loss.

• Civil containment: hydraulic barriers for wastewater lagoons and decorative ponds.
• Foundry: green sand binder delivering consistent mold hardness.
• Drilling: viscosifier and filtration reducer in water‑based muds.
• Agriculture: carrier for pesticide granules and soil amendment for water retention.

Quality Control Philosophy

Each batch undergoes verification of montmorillonite content via X‑ray diffraction, ensuring the active phase meets the advertised range. Swelling capacity is measured under standardized conditions to confirm performance in sealing applications. Particle size distribution is checked to guarantee proper mixing behavior in slurry or sand systems. All tests follow recognized ASTM or ISO procedures, and results are retained for traceability.

Packaging and Handling

Bulk sodium bentonite is typically shipped in 25 kg multi‑wall paper bags, 500 kg polypropylene bulk bags, or loose in pneumatic tankers for large‑scale projects. The material is hygroscopic; therefore, storage in a dry, covered area is recommended to prevent premature hydration. When handling, use dust‑control measures such as local exhaust ventilation or respiratory protection, as fine particles can become airborne during transfer.

• Bagged: 25 kg paper bags with polyethylene liner, palletized 40 bags per pallet.
• Bulk bag: 500 kg PP bag with lift loops, suitable for forklift handling.
• Tanker: pneumatic discharge, moisture‑protected interior.

Frequently Asked Questions

• Can the swelling index be adjusted for specific projects? Yes, blending with calcium bentonite or adding polymers can modify the swelling rate and final gel strength.
• What information is needed for a quotation? Required details include desired quantity, packaging preference, delivery destination, and any special specifications such as maximum moisture content or particle size limits.
• Is the clay suitable for food‑grade applications? Standard industrial sodium bentonite is not food‑grade; however, purified grades meeting FDA 21 CFR 184.1155 are available upon request.
• How is quality verified before shipment? Each lot is accompanied by a certificate of analysis showing montmorillonite content, moisture, pH, and swelling index based on the most recent test.

Ready to Discuss Your Requirements?

If you need technical data sheets, sample material, or a formal quote for bulk sodium bentonite clay, please reach out with your project specifics. Our team will respond with the relevant information and lead‑time estimates.