Potassium Sulfate CAS#7778-80-5
High Solubility: Potassium sulfate shows moderate solubility in water, insoluble in ethanol, acetone and other organic solvents, which makes it suitable for agricultural and industrial scenarios requiring aqueous system application.
Stable Performance: Its aqueous solution is weakly neutral. The solid form keeps stable under normal temperature and sealed storage without easy decomposition.
Versatile Uses: It is widely used as high-grade potassium fertilizer, raw material for potassium salts production, and additive in glass, dye and pharmaceutical industries.
Crystalline Form & Hygroscopic Nature: This material is provided as a white crystalline powder or granule with low hygroscopicity, so it is not easy to cake during regular storage and transportation.
Potassium sulfate, characterized by the molecular formula K₂SO₄, presents as a white crystalline powder or granule with low hygroscopic properties. It exhibits moderate solubility in water (111 g/L at 20°C), insoluble in ethanol and acetone. A 10% aqueous solution of this compound maintains a pH range of 6.0–7.5, showing good stability under normal temperature. The substance may cause slight irritation to eyes, skin and respiratory tract, and it is utilized for high chlorine-free potassium fertilizer, raw material for other potassium chemicals, glass clarifier, and analytical reagent.
Potassium Sulfate Chemical Properties
| Item | Specification |
|---|---|
| Melting point | 1067 °C (lit.) |
| Density | 2.66 g/cm³ |
| Refractive index | 1.494 |
| Storage temp | Store below +30°C, keep sealed |
| Solubility | Water: 111 g/L (20°C); insoluble in ethanol, acetone |
| Form | Crystalline powder / granule |
| Color | White |
| Odor | Odorless |
| PH Range | 6.0–7.5 (10% aqueous solution, 20℃) |
| Water Solubility | 111 g/L (20 º C) |
| Sensitive | Low hygroscopicity |
| Stability | Stable. Incompatible with strong acids, barium salts |
| CAS DataBase Reference | 7778-80-5 (CAS DataBase Reference) |
| NIST Chemistry Reference | Potassium sulfate (7778-80-5) |
| EPA Substance Registry System | Potassium sulfate (7778-80-5) |
Safety Information
| Item | Specification |
|---|---|
| Hazard Codes | Xi |
| Risk Statements | 36/37/38 |
| Safety Statements | 26-36 |
| WGK Germany | 1 |
| RTECS | TT5900000 |
| TSCA | Yes |
| HS Code | 31043000 |
This compound is employed as chlorine-free potassium fertilizer for cash crops such as fruits, vegetables and tobacco. It also functions as a raw material for manufacturing potassium alum, potassium carbonate and other potassium products, a clarifying agent for glass production, an additive in dye industry, and an analytical reagent in laboratories. Additionally, it finds application in gypsum board production and as a feed mineral supplement.
