Bentonite powder is the fine-ground form of bentonite clay, milled to 100, 200, or 300 mesh for applications where granules are too coarse: ceramic body and glaze formulations, foundry sand bonding (where powder disperses more uniformly than granules), drilling mud (where fine powder hydrates faster), and industrial filler systems for paint, plastic, and rubber compounding. Our Bhavnagar facility operates a Raymond mill and air classifier dedicated to bentonite powder production, with capacity for 15–20 MT per day across all mesh grades.
The critical quality parameter for bentonite powder is mesh consistency. A powder specified at 200 mesh with 95% pass means that 95% of the material must pass through a 75-micron sieve. If actual pass rate is 85% instead of 95%, the buyer's formulation — whether it is a ceramic glaze, a foundry sand mix, or a drilling mud — will not perform as designed. Our milling and classification system is calibrated to deliver the specified mesh pass rate with no more than ±2% variation batch to batch.
Moisture control is the second critical parameter. Powder with excess moisture clumps during storage, flows poorly through hoppers and feeders, and adds unwanted water to the buyer's formulation. Our powder is dried to below 8% moisture before milling and packed in moisture-barrier bags to maintain that low moisture through transport and warehouse storage.
Technical Specifications
Factory-Direct Pricing
15–30% lower than marketplace rates. No middlemen.
Mesh Control — Why It Matters for Your Application
Different industries require different mesh specifications, and supplying the wrong mesh is one of the most common causes of bentonite powder rejection. A ceramic glaze manufacturer needs 300 mesh (45 micron) powder because any particle larger than 45 microns creates a visible speck in the fired glaze surface — a cosmetic defect that ruins finished product. A foundry needs 200 mesh powder because coarser particles do not disperse evenly in the sand mixer; finer 300 mesh is unnecessary and adds cost. A drilling contractor needs 200 mesh with specific fluid loss control properties that depend on the clay mineralogy, not just the particle size.
We do not sell "one mesh fits all" bentonite powder. When a buyer enquires, the first question our team asks is: "What is the application?" The answer determines the recommended mesh grade, the QC parameters we test, and the packing format. This application-first approach reduces the risk of the buyer receiving technically correct but practically unusable material.
Raymond Mill Processing at Our Bhavnagar Facility
Raw bentonite enters the milling circuit at 8–12% moisture and approximately 25 mm top size from the crusher. It passes through a rotary dryer to reduce moisture below 8%, then enters the Raymond mill where rotating rollers grind the dried clay against a grinding ring. The ground material is carried by an air stream to the classifier, which separates particles by size — fine particles that meet the target mesh pass through to the collection cyclone; oversize particles are returned to the mill for further grinding.
The classifier speed is the primary control for mesh specification: higher speed produces finer powder (300 mesh); lower speed produces coarser powder (100 mesh). Between production runs of different mesh grades, the mill and classifier are purged to prevent cross-contamination. Each production batch is sampled and tested for mesh analysis before packing.
Why Bhavnagar Leads in Bentonite Powder Milling
Bentonite powder milling has been a core activity in Bhavnagar for over 40 years — long before the cat litter and granules markets developed. The district's early bentonite industry was built on supplying 200-mesh powder to foundries in Rajkot, Ahmedabad, and Bhavnagar city itself. This decades-long history means Bhavnagar has the deepest pool of milling expertise in India: operators who can diagnose a Raymond mill by sound, classifier technicians who can adjust cut points within ±5 microns, and maintenance crews who keep mills running at 90%+ uptime even during peak demand months.
Our own milling circuit benefits from this ecosystem. When a Raymond mill grinding ring needs replacement — typically every 1,500–2,000 operating hours — we source the replacement from a Bhavnagar-based foundry that specialises in mill wear parts. The technician who installs it has worked on bentonite Raymond mills for 10+ years. These local supply chains and skill pools are the invisible advantage of manufacturing bentonite powder in Bhavnagar rather than in regions without bentonite processing history.
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View full categoryFrequently Asked Questions
What mesh size should I order for my application?
General guidance: 300 mesh for ceramics (glaze and body), 200 mesh for foundry and standard drilling, 100 mesh for fertilizer binding and civil engineering. If you are unsure, share your application and we will recommend the appropriate mesh and provide a sample for validation.
How do you prevent moisture pickup during powder storage and transport?
Bentonite powder is hygroscopic — it absorbs moisture from the air. We pack in laminated PP bags with an inner polyethylene liner that acts as a moisture barrier. For export shipments and monsoon-season domestic dispatches, we add a silica gel desiccant pouch inside each bag. Buyers storing powder for more than 3 months should keep bags in a dry, covered warehouse.
Can you produce custom mesh blends?
Yes. If your application requires a specific particle size distribution (e.g., 80% passing 200 mesh, 20% retained on 325 mesh), we can adjust the classifier settings to produce the target distribution. MOQ for custom mesh is 5 MT.
Do you provide fluid loss testing for drilling-grade powder?
Yes. Drilling-grade bentonite powder is tested for API fluid loss (ml/30 min), apparent viscosity, and yield point. Test results are provided on the certificate of analysis with each drilling-grade shipment.