CAS 7757-82-6: Sodium Sulfate (Na2SO4)
Identity
| CAS Number | 7757-82-6 |
| Molecular Formula | Na2SO4 |
| IUPAC Name | sodium sulfate |
| Molecular Weight | 142.04 g/mol |
| SMILES | [Na+].[Na+].[O-]S(=O)(=O)[O-] |
| Synonyms | salt cake, Glauber's salt (decahydrate), thenardite, Na2SO4 |
2D Structure
Physical Properties
| Density | 2.66 g/mL at 25°C |
| Boiling Point | None°C |
| Melting Point | 884.0°C |
| Flash Point | None°C |
| Vapor Pressure | 0.0 kPa at 20°C |
| Refractive Index | nD = 1.477 |
| Dielectric Constant | ε = 8.0 |
Safety & GHS Classification
Storage: Store in dry, tightly sealed containers. Very low toxicity. Anhydrous form is hygroscopic. Generally Recognized as Safe (GRAS).
Material Compatibility Matrix
Plastics
| Material | Rating |
|---|
| PTFE | Excellent |
| PVC | Good |
| PE | Excellent |
| PP | Excellent |
| PEEK | Excellent |
| PVDF | Excellent |
Rubbers
| Material | Rating |
|---|
| Viton | Excellent |
| NBR | Excellent |
| EPDM | Excellent |
| Silicone | Excellent |
| FKM | Excellent |
Metals
| Material | Rating |
|---|
| Stainless 316 | Excellent |
| Aluminum | Good |
| Copper | Good |
| Brass | Good |
Applications
- Detergent builder (50% of demand)
- Kraft pulping (recovery boiler chemical)
- Glass manufacturing (fluxing agent)
- Textile dyeing and printing
- Carpet deodorizer (consumer product)
- Laxative (Glauber's salt)
- Cattle feed supplement
- Heat storage (phase change material)
External References: PubChem
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