Handling: Minimize dust generation, avoid breathing dust and prevent eye contact. Use suitable ventilation, protective gloves and eye protection according to the current supplied-grade SDS and workplace exposure assessment.
Storage: Keep containers tightly closed in a dry area and protect the anhydrous material from moisture and contamination. Follow the current SDS for any additional storage and compatibility requirements.
Shipping: Confirm the applicable transport classification and packaging requirements against the current supplied-grade SDS and the selected transport mode before dispatch.
Documentation: Request the current SDS and confirmed batch-specific COA before ordering. This page provides procurement reference information and does not replace the SDS, an analytical-method qualification or a process safety assessment.
Sodium Sulfate Anhydrous CAS 7757-82-6
Sodium Sulfate Anhydrous CAS 7757-82-6 from Aure Chemical
Sodium sulfate anhydrous, Na₂SO₄, CAS 7757-82-6, is an inorganic salt used in powdered detergent formulations, glass production, textile processing, chemical manufacture and selected laboratory drying applications. Aure Chemical supports China sourcing and export supply, including specification review, quality documentation and supplier coordination. The reference quality data below describe a reagent-grade specification with sodium sulfate content of ≥99.0%.
This page covers anhydrous sodium sulfate. Glauber’s salt is sodium sulfate decahydrate, Na₂SO₄·10H₂O, a separate hydrated form with different physical properties and water content. Hydration state and grade should be specified when requesting a quotation.
Basic Information of Sodium Sulfate Anhydrous
The identity and general physical properties below apply to anhydrous sodium sulfate. Reference properties are distinct from the reported acceptance limits and individual analytical results in the quality analysis section.
| CAS No.: | 7757-82-6 |
|---|---|
| EC No.: | 231-820-9 |
| Chemical Formula: | Na₂SO₄ |
| Molecular Weight: | 142.04 g/mol |
| Hydration State: | Anhydrous |
| Appearance: | White granules (reference analytical result) |
| Melting Point: | Approximately 884 °C (reference value) |
| Solid Density: | 2.68 g/cm³ at 25 °C (reference value; not bulk density) |
| Solubility: | Soluble in water. Dissolution behavior depends on temperature and concentration. |
| Chemical Nature: | Non-combustible inorganic salt. Protect the anhydrous material from moisture during storage. |
| Chemical Structure: |  |
The reference report provides composition, solution-quality and impurity information. Requirements for particle size, bulk density, drying performance or application-specific qualification should be confirmed separately.
Reference Quality Analysis
The following parameters provide a technical reference for evaluating reagent-grade anhydrous sodium sulfate, including assay, pH, solution clarity, ignition loss, insoluble matter and selected ionic and trace impurities. The report cites GB/T 9853-2008, Chemical reagent — Sodium sulfate anhydrous, as its test basis. Reported acceptance limits are shown separately from the reference analytical results.
Physical and Chemical Quality Parameters
| Test Item | Reported Specification | Reference Result |
|---|---|---|
| Sodium Sulfate Content (Na₂SO₄, %) | ≥99.0% | 99.90% |
| pH (50 g/L, 25 °C) | 5.0–8.0 | 6.3 |
| Clarity Test (reported scale) | ≤3 | Pass |
| Loss on Ignition (%) | ≤0.2% | 0.03% |
| Water-Insoluble Matter (%) | ≤0.005% | 0.004% |
| Appearance | Not stated | White granules |
The clarity-test limit is reproduced on the report’s stated scale; no NTU unit is assigned. The result is reported as a qualitative pass, rather than a numerical clarity measurement. No appearance acceptance criterion is stated in the report. Loss on ignition is a separate test and should not be treated as a water-specific result; the ignition conditions are not specified in the report.
Ionic and Trace Impurities
| Test Item | Reported Specification | Reference Result |
|---|---|---|
| Chlorides (as Cl, %) | ≤0.001% | 0.0008% |
| Phosphates (as PO₄, %) | ≤0.001% | <0.001% |
| Potassium (K, %) | ≤0.01% | 0.002% (to be confirmed) |
| Calcium (Ca, %) | ≤0.002% | 0.001% |
| Iron (Fe, %) | ≤0.0005% | 0.0002% |
| Heavy Metals (as Pb, %) | ≤0.0005% | 0.0003% |
| Total Nitrogen (as N, %) | ≤0.0005% | <0.0002% |
Potassium confirmation: The potassium reference result is provisionally entered as 0.002% following a requested correction. This value requires confirmation in the final batch-specific COA before it is used for purchasing acceptance or a claim of conformity.
Chlorides, phosphates, heavy metals and total nitrogen are reported on the respective Cl, PO₄, Pb and N bases shown in the table. “Heavy metals as Pb” is a reported combined-test expression and should not be read as an individual lead assay. Results preceded by “<” retain the report’s inequality; they are not zero values.
These analytical values are provided for preliminary technical evaluation and should not be interpreted as guaranteed results for every shipment. Please contact Aure Chemical to confirm the applicable quality requirements and request the relevant batch-specific Certificate of Analysis (COA) before ordering. Any claim of compliance with a particular reagent or application standard requires review of the final specification and confirmed results.
Primary Applications of Sodium Sulfate Anhydrous
Sodium sulfate is used as a formulation component, process input or drying reagent depending on the grade. Particle form, soluble and insoluble impurities, and the intended process determine the appropriate purchasing specification.
Detergents and Cleaning Products: Used as a filler or diluent in selected powdered detergent formulations. Particle size, bulk density, moisture behavior and compatibility with the other ingredients should be evaluated for the actual formulation; the reference report does not establish powder-flow performance.
Pulp and Paper Processing: Used as a makeup chemical in the kraft recovery cycle to replenish sodium and sulfur. Sodium sulfate is reduced to sodium sulfide in the recovery process; the regenerated pulping chemicals contribute to lignin removal. Addition requirements depend on the mill’s chemical balance and recovery conditions.
Glass Manufacturing: Used as a fining agent to assist gas-bubble removal from glass melts and as a source of sodium oxide in selected glass batches. Its effect depends on glass composition, furnace conditions and redox balance. Iron and other impurities should be assessed against the required glass color and quality.
Textile Dyeing: Used as an electrolyte in selected dyeing systems to influence dye exhaustion onto fibers. Addition rate, concentration, dye chemistry and processing conditions determine the result; uniform coloration requires formulation and process validation.
Chemical Manufacture: Used as a raw material in selected sodium sulfide production routes and other chemical processes. Purity and impurity requirements depend on the reaction and downstream product specification.
Laboratory Drying Agent: Appropriately qualified anhydrous sodium sulfate is used to remove traces of water from organic extracts. Required drying performance, particle form and contaminant limits depend on the analytical or synthetic procedure. The reference ignition-loss result alone does not establish water content or suitability for trace analysis.
Food, feed and pharmaceutical applications require separate confirmation of the applicable grade and supporting documentation. The reference reagent report does not establish qualification for those uses.
Aure Chemical: Sodium Sulfate Sourcing and Export Support
Aure Chemical is a chemical trading and export supply company supporting sodium sulfate purchases from China through specification review, supplier coordination, quality documentation and international export logistics.
Specification Review: Confirm hydration state, grade, sodium sulfate content, pH, solution quality and impurity requirements. Any limits for particle size, bulk density or application-specific performance should be stated before ordering.
Quality Documentation: Confirm availability of the applicable technical specification, current supplied-grade SDS and batch-specific COA. Reported acceptance limits are kept separate from reference results, and provisional values require confirmation.
Supplier Coordination: Review grade availability, quantity, packaging, lead time and additional testing or inspection arrangements for each inquiry.
Export Logistics: Coordinate packaging, shipping documentation and transport arrangements according to the current SDS, order quantity, transport mode and destination requirements.
Please provide the required quantity, destination and purchasing specification so that Aure Chemical can review the available supply options and supporting documentation.
Safety, Handling & Documentation
Packaging
25 kg bag
Final packaging, capacity and net weight are confirmed in the quotation and order.
