Product Overview & China Production Capacity
Magnesium Stearate (CAS 557-04-0, molecular formula Mg(C₁₈H₃₅O₂)₂, MW 591.27) is the single most widely used lubricant in global pharmaceutical solid dosage manufacturing. Used at concentrations of 0.25–1.5%, it reduces friction between tablet granulation and die walls during compression, prevents sticking to punches, and improves powder flow in capsule filling operations. It is estimated that over 50% of all pharmaceutical tablets and capsules produced worldwide contain magnesium stearate as a lubricant.
China is the world’s largest magnesium stearate producer with annual capacity exceeding 150,000 MT across all grades. Our facility in Hebei Province operates dedicated pharmaceutical-grade lines producing 20,000 MT/year through both fusion (direct reaction) and precipitation processes, offering customers the choice of process-specific particle characteristics to match their tableting requirements.
Manufacturing Standards & Quality Assurance
Our production facility holds cquality certification with ISO 9001:2015 quality management. The product meets USP/NF, EP, BP, JP, and ChP monograph specifications for Magnesium Stearate. We produce exclusively vegetable-origin magnesium stearate from palm and soybean-derived stearic acid — no animal (bovine/porcine) tallow is used. BSE/TSE-free declarations, Halal, and Kosher certifications are maintained.
Quality control includes stearic acid and palmitic acid content (GC), total fatty acid content, MgO assay, loss on drying, chloride, sulfate, heavy metals, arsenic, and microbial limits. Critical performance parameters including specific surface area (BET), particle size distribution, bulk density, and lubrication efficiency are tested on every batch using standardized tablet ejection force measurements.
Technical Specifications
| Parameter | Specification |
|---|---|
| Appearance | Fine white powder, faint fatty odor |
| Stearic Acid + Palmitic Acid (total) | ≥90.0% (of fatty acid fraction) |
| Stearic Acid Content | ≥40.0% |
| MgO Content | 4.0–5.0% |
| Loss on Drying | ≤6.0% |
| Chloride | ≤0.1% |
| Sulfate | ≤1.0% |
| Heavy Metals (as Pb) | ≤10 ppm |
| Arsenic (As) | ≤3 ppm |
| Specific Surface Area (BET) | 4–12 m²/g (grade dependent) |
Packaging & Export Logistics
Packaged in 25 kg paper bags with PE inner liner or 20 kg cartons. Bulk packaging in 500 kg FIBCs available. Store in a cool, dry place at 15–25°C away from strong acids and oxidizing agents. Shelf life is 36 months. Non-hazardous for transport. Container loading: approximately 16–18 MT per 20′ FCL.
We export from Tianjin, Shanghai, and Shenzhen ports to pharmaceutical manufacturers in over 80 countries. Complete documentation includes COA, MSDS, DMF authorization letters, vegetable-origin declaration, BSE/TSE-free certificate, and Halal/Kosher certifications.
China Supply Advantage
Chinese pharmaceutical-grade magnesium stearate pricing is 35–50% below Western metal stearate producers, making it the clear cost leader globally. Our vertically integrated production from fatty acid splitting through stearate synthesis ensures quality consistency, supply security, and competitive unit economics at any volume.
MOQ is 500 kg with 5–7 business day lead time from stock. We offer standard, high-purity, and ultra-fine grades with different surface areas optimized for various tableting speeds and formulation types. Technical support includes lubrication efficiency studies, blending time optimization, and dissolution impact assessment. Contact us for the most competitive pharma-grade magnesium stearate pricing available.