Sodium Sulfate
Versatile Chemical Raw Material: Sodium sulfate is a key industrial raw material used in the production of sodium sulfide, sodium silicate, and other important chemical products, supporting a wide range of manufacturing applications.
Stable Physical and Chemical Properties: With a high melting point (884 °C), neutral aqueous solution, and stable crystalline structure, sodium sulfate offers reliable performance under various processing conditions.
Good Solubility and Processing Compatibility: It dissolves readily in water and glycerol, enabling easy handling and efficient use in chemical reactions and industrial formulations.
High Purity Options for Specialized Uses: High-purity, fine-grained anhydrous sodium sulfate (Glauber’s salt) is available, making it suitable for applications requiring strict quality and purity control.
Products Description of Sodium Sulfate CAS#7757-82-6
Sodium sulfate is a key inorganic chemical raw material and an essential feedstock for the manufacture of products such as sodium sulfide and sodium silicate. It is also known as Glauber’s salt or anhydrous sodium sulfate. The product appears as white monoclinic crystals in fine crystalline or powder form, with a relative density of 2.68 and a high melting point of 884 °C. It dissolves readily in water to form a neutral solution, is soluble in glycerol, and insoluble in ethanol. When exposed to air, it easily absorbs moisture and converts to hydrated sodium sulfate. Sodium sulfate is a uniform polycrystalline substance: it exists in a rhombic crystal form at temperatures between 32.4 °C and 223 °C, changes to a monoclinic structure at higher temperatures, and transforms into a hexagonal crystal form at around 241 °C. During crystallization from solution, it shows an affinity for iron, iron compounds, and various organic substances. High-purity, fine-particle anhydrous sodium sulfate is commonly referred to as Glauber’s salt.
Sodium sulfate Chemical Properties
Melting point | 884 °C (lit.) |
Boiling point | 1700°C |
density | 2.68 g/mL at 25 °C (lit.) |
refractive index | 1.484 |
storage temp. | Store at +5°C to +30°C. |
solubility | H2O: 1 M at 20 °C, clear, colorless |
form | powder (fine) |
Specific Gravity | 2.68 |
color | White |
PH | 5.2-8.0 (50g/l, H2O, 20℃) |
PH Range | 5.2 - 9.2 |
Odor | wh. cryst. or powd., odorless, bitter saline taste |
Water Solubility | 18.5 mg/L |
λmax | λ: 260 nm Amax: 0.015 |
Sensitive | Hygroscopic |
Merck | 14,8680 |
Dielectric constant | 2.7（Ambient） |
Stability: | Stable. Incompatible with strong acids, aluminium, magnesium, strong bases. Hygroscopic. |
LogP | -1.031 (est) |
CAS DataBase Reference | 7757-82-6(CAS DataBase Reference) |
NIST Chemistry Reference | Sodium sulfate(7757-82-6) |
EPA Substance Registry System | Sodium sulfate (7757-82-6) |
Safety Information
Hazard Codes | Xi |
Risk Statements | 36/37/38 |
Safety Statements | 24/25 |
WGK Germany | 1 |
RTECS | WE1650000 |
F | 3 |
TSCA | Yes |
HS Code | 28331100 |
Hazardous Substances Data | 7757-82-6(Hazardous Substances Data) |
Toxicity | LD50 orally in Rabbit: > 2000 mg/kg |
Product Application of Sodium Sulfate (CAS#7757-82-6)
Sodium sulfate is a key raw material in the glass and paper industries, with its largest consumption in papermaking and cellulose production, accounting for roughly 70% of total usage. It is also an essential ingredient in synthetic detergents, where it acts as a neutral salt to reduce surface tension and improve detergent solubility.
In addition, sodium sulfate is used as a dye diluent and an auxiliary agent in dyeing and printing processes. It functions as a dyeing accelerator for cotton fibers with direct, sulfur, and vat dyes, and as a retarding agent in silk dyeing with direct dyes. Within the chemical industry, sodium sulfate serves as a raw material for the production of sodium sulfide, gypsum, sodium silicate, and other chemical products.
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