Product Overview & China Production Capacity
Sodium Sulfate (Na₂SO₄, CAS 7757-82-6, MW 142.04) is an inorganic salt used in pharmaceutical bowel preparation solutions, as a laboratory reagent, and across numerous industrial applications including detergent manufacturing, textile dyeing, and glass production. China is the world’s largest sodium sulfate producer with annual capacity exceeding 10 million metric tons from natural mineral deposits (mirabilite) in Sichuan, Jiangsu, Inner Mongolia, and synthetic by-product recovery operations nationwide.
In pharmaceutical applications, sodium sulfate (anhydrous) serves as a component in bowel cleansing preparations for colonoscopy preparation. Glauber’s salt (Na₂SO₄·10H₂O, the decahydrate form) has traditional use as a mild saline laxative. Anhydrous sodium sulfate is also widely used as a laboratory drying agent. Chinese producers supply both anhydrous and decahydrate forms in multiple purity grades from industrial to pharmacopoeial quality.
Manufacturing Standards & Quality Assurance
Pharma-grade production facilities maintain ISO 9001:2015 and China quality certifications. Quality testing includes assay (gravimetric), chloride, calcium, magnesium, heavy metals, iron, arsenic, loss on drying (anhydrous grade), and microbial limits. Products meet USP/NF, EP, and ChP monograph requirements. Natural mirabilite extraction yields inherently high-purity sodium sulfate that requires minimal processing to achieve pharma-grade specifications.
Processing involves dissolution of natural mirabilite, purification through controlled crystallization, and drying at precisely managed temperatures to produce either the anhydrous or decahydrate form. Particle size classification meets grade-specific requirements. Quality documentation includes full batch traceability and stability data.
Technical Specifications
| Parameter | Specification |
|---|---|
| CAS Number | 7757-82-6 (anhydrous) |
| Molecular Formula | Na₂SO₄ |
| Molecular Weight | 142.04 g/mol |
| Appearance | White crystalline powder |
| Assay | ≥99.0% |
| pH (5% aqueous) | 5.2–8.0 |
| Chloride | ≤0.02% |
| Heavy Metals (Pb) | ≤10 ppm |
| Iron | ≤10 ppm |
| Pharmacopoeial Compliance | USP/NF, EP, ChP |
Packaging & Export Logistics
Sodium sulfate is supplied in 25 kg or 50 kg PE-lined woven bags, palletized for container loading. Bulk supply in 1,000 kg jumbo bags or loose bulk (for industrial grades) is available. Lead time is 5–10 business days. FOB shipment from Tianjin, Qingdao, or Shanghai ports; CIF and DDP terms supported.
Non-hazardous classification simplifies global transport logistics. Documentation includes CoA, SDS, and commercial shipping paperwork.
China Supply Advantage
China’s abundant natural mirabilite deposits provide the world’s most cost-effective sodium sulfate production, delivering competitive pricing 40–60% below synthetic production costs in other regions. Massive scale and multiple production bases ensure year-round supply reliability. Chinese sodium sulfate producers export to customers in over 80 countries across pharmaceutical, detergent, textile, and glass manufacturing industries with consistent quality and professional logistics support.