Trisodium Phosphate CAS：7601-54-9
High Purity Crystalline Structure： This high-grade product consists of neatly arranged hexagonal crystalline particles. Under standard storage environments, the crystals present a white or clear transparent appearance.
Aqueous Solubility： It exhibits good dissolution performance in water. At 20°C, the solubility reaches approximately 28 g per 100 mL of water.
Marked Alkalinity ：A 0.1 mol/L water solution of this substance delivers strong alkaline characteristics, with the pH reading stabilizing near 11.5.
Heat Resistance and Hydration Stability ：Extended heating will hardly trigger decomposition of its crystal lattice or loss of crystal water. The compound maintains excellent stability of its hydrate structure.
This dodecahydrate chemical exists as white or translucent hexagonal crystals, with a density of 1.62 g/cm³. Rapid heating brings about melting at around 75°C. Crystal water begins to volatilize once the temperature rises to 100°C, while the final fraction of coordinated water remains tightly bound and will not be removed even under continuous heat treatment.
The substance has high water solubility: 28 g can be completely dissolved in 100 mL of water at 20°C. A 0.1 mol/L aqueous solution shows pronounced alkaline behavior at pH 11.5. Besides, it is practically insoluble in alcoholic solvents.
Parameters
| Core Performance Index | Index Details |
| Thermal & Density Property | Melting point reaches 1340°C; density is 2.536 g/cm³ (measured at 17.5°C); vapor pressure is negligible at 20°C |
| Solubility Profile | Only minimally soluble in water; no dissolution observed in ethanol and carbon disulfide |
| Appearance & Storage Guidance | Off-white, scent-free fine powder with high moisture absorption; keep sealed under inert atmosphere at ambient temperature |
| Aqueous Alkalinity Profile | pH readings of aqueous solutions: 10.95 (1mM), 11.71 (10mM), 12.12 (100mM) |
| Registration Identification | CAS No.:7601-54-9, EPA recognized identity: Trisodium phosphate; full molecular identifier available upon request |
Safety Information
| Safety Core Items | Details |
| Hazard Classification & Risk Phrases | Hazard symbols C, Xi; risk statements 34/36/37/38; precautionary codes 26/36/37/39/45/24/25 |
| Shipment Classification | UN3262, Category 8 corrosive substance, Packing Group III |
| Eco & Combustion Risk | German water hazard class WGK 1; fire hazard identifier F34 |
| Compliance & Inventory Status | Included in RTECS (TC9490000), TSCA inventory; Hazardous Substance ID:7601-54-9 |
| Toxicity Reference | Acute dermal LD50 on rabbit > 300 mg/kg |
Trisodium phosphate, or TSP, is an inorganic chemical with a broad spectrum of industrial usages. It works excellently as a cleaning ingredient for heavy-duty industrial cleaners and floor sanitizers for washroom areas. Besides that, it is widely adopted for metal surface pretreatment. It can also be applied for water hardness reduction, boiler feedwater conditioning, paint stripping, photo developing operations, leather processing, papermaking, and sugar syrup purification.
