Sodium bentonite

When evaluating Sodium Bentonite, the most critical parameters are the Montmorillonite content (ideally >85%), Cation Exchange Capacity (CEC), and Swelling Index. For drilling applications, ensure it meets API Spec 13A standards. For civil engineering or foundry use, verify the liquid limit and thermal stability. Always request a Particle Size Distribution (PSD) report to ensure it matches your specific machinery requirements.

You should request a Certificate of Analysis (COA) for every batch. High-quality Sodium Bentonite should have a swelling power of at least 20-30 ml/2g. It is essential to distinguish between natural sodium bentonite and sodium-activated bentonite (calcium bentonite treated with soda ash), as the natural variety typically offers superior long-term stability and higher thermal resistance in demanding environments.

Ensure the supplier provides a current Material Safety Data Sheet (MSDS) or Safety Data Sheet (SDS). For environmental projects, the product must be non-toxic and heavy-metal free. If used in food or wine clarification, it must comply with Food Grade (FCC) standards. For construction, check for ISO 9001 certification to ensure consistent processing and moisture control (typically max 12% moisture content).

Sodium Bentonite is highly versatile. In Drilling Fluids, it acts as a lubricant and sealant; in Foundry Sand, it serves as a high-strength binder; in Civil Engineering, it is used for slurry walls and pond liners due to its low permeability. Additionally, it is a staple in Iron Ore Pelleting and as a clarifying agent in the beverage industry.

The biggest risk is moisture contamination during sea transit, which can cause clumping and loss of efficacy. Mitigate this by specifying moisture-proof packaging (e.g., 25kg PE/PP bags or 1-ton Jumbo bags with liners). Use Made-in-China.com's Secured Trading services to ensure that payment is only released after a third-party inspection (like SGS or Intertek) confirms the chemical composition at the loading port.

Minerals are heavy and low-value per ton, so freight costs significantly impact the landed cost. Negotiate based on FOB (Free On Board) terms if you have a reliable forwarder, or CIF (Cost, Insurance, and Freight) if you want the supplier to handle the risk to your port. For orders exceeding 100 tons, aim for a 10-15% volume discount and request free samples (5-10kg) for lab testing before committing to a full container load.

Due to its weight, Sodium Bentonite is usually shipped in 20ft containers to maximize weight capacity (approx. 20-27 tons per container). Ensure the supplier provides proper palletization and shrink-wrapping to prevent bag breakage. Check your local customs tariff codes (HS Code 250810) for any specific import duties or environmental levies applicable in your country.

Always verify the supplier's Business License and Export Permit. Prioritize Audited Suppliers on Made-in-China.com, as they have undergone on-site verification. Use Letter of Credit (L/C) for large-scale contracts to protect your capital, and never transfer funds to personal bank accounts; always use the official corporate account listed on the verified platform profile.