SODIUM SULFATE- ▸ Kraft pulping: Makeup chemical in kraft paper and paperboard manufacture.
- ▸ Glass: Fining and fluxing agent in glass production.
- ▸ Detergents: Filler in powdered synthetic detergents.
- ▸ Textiles: Leveling and dyeing aid in textile processing.
- ▸ Drying agent: Desiccant for organic liquids.
A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.
Request SDS →Sodium sulfate (CAS 7757-82-6), the anhydrous form known as salt cake, is an inorganic sulfate salt. HSDB documents its use in the manufacture of kraft paper, paperboard, and glass, as a filler in synthetic detergents, in textile dyeing and printing, and as a drying agent for organic liquids. It is also used in ceramic glazes and as a laboratory reagent.
Regulatory & registration requirements
- TSCA (US):
- REACH (EU):
- EC number: 231-820-9
Source: EPA TSCA Inventory (July 2025 release) · ECHA CHEM — retrieved 2026-07-12
Solutions Using This Product
Process-solution guides on this site that specify this chemistry:
- Leveling Agents & Salt for Even Reactive Dyeing on Cotton (Textiles)
- Spray-Dry Compatible Surfactants & Builders for Powders (Home & Industrial Care)
Frequently Asked Questions
What is sodium sulfate used for?
Sodium sulfate (CAS 7757-82-6), the anhydrous form known as salt cake, is an inorganic sulfate salt used as a makeup chemical in kraft paper and paperboard pulping, as a fining and fluxing agent in glass production, and as a filler in powdered synthetic detergents. It also serves as a leveling and dyeing aid in textile processing and as a desiccant for drying organic liquids.
What happens when you mix sodium sulfate with water?
Sodium sulfate is water-soluble and dissolves to give a neutral solution of sodium and sulfate ions. The anhydrous salt cake is hygroscopic and dissolution is mildly endothermic; this solubility behavior is why it functions as a leveling agent in textile dyeing. Consult the SDS for full handling data.
What is the CAS number for sodium sulfate?
Sodium sulfate carries CAS 7757-82-6, molecular formula Na2SO4. The anhydrous grade we supply is the form commonly referred to in industry as salt cake. Each shipment is accompanied by a Certificate of Analysis and SDS.
What HS code is used to ship sodium sulfate?
Sodium sulfate is classified under HS heading 2833.11 (Sulfates: disodium sulfate). This code applies for import/export documentation; confirm the destination-country tariff line with your broker before shipping.
What is the cost of bulk sodium sulfate?
Bulk sodium sulfate pricing depends on grade, volume, and packaging (bags, supersacks, or bulk). Submit a bulk RFQ with your target quantity and delivery point and we will return a current quote with CoA and SDS.
What is the REACH and TSCA regulatory status of Sodium Sulfate (Salt Cake)?
Sodium Sulfate (Salt Cake) (CAS 7757-82-6) is subject to U.S. TSCA Inventory requirements; supplying it into the EU requires valid REACH registration ((EC) No 1907/2006). RawSource cannot verify a third-party supplier's registrations — buyers should require documented TSCA and REACH compliance for their jurisdiction and volume (EC 231-820-9).