Sodium Tripolyphosphate (Food Grade) CAS#7758-29-4
High Solubility:This chemical delivers favourable dissolution capability in both cold and hot water. It will not dissolve within ethanol or other organic solvent systems. Homogenous liquid mixtures can be readily prepared to support compounding workflows for food‑grade manufacturing.
Stable pH Performance:Its aqueous mixture exhibits mild alkaline characteristics and maintains steady pH readings. The substance keeps reliable chemical stability under room‑temperature conditions as well as moderate thermal exposure. Its hydrolytic reaction proceeds at a low rate within neutral or weakly‑alkaline surroundings.
Versatile Functional Properties:Within food‑processing sectors, it serves multiple practical roles including moisture‑locking additive, metal‑ion sequestrant, texture tendering agent and emulsion stabilizer. These functions help optimize organoleptic properties of finished food goods and prolong their shelf‑storage period.
Crystalline Form & Hygroscopic Trait：This food‑compliant substance occurs as whitish crystalline or granular solids and displays modest moisture‑absorbing tendency without any odour. Its physical nature facilitates precise weighing operations, smooth bag‑packaging work and routine warehouse inventory administration.
Sodium tripolyphosphate (Na₅P₃O₁₀, STPP) is an odorless white crystalline food-grade additive. It exhibits excellent metal sequestering, dispersing and moisture retention effects. Featuring stable chemical traits and low irritancy, this material satisfies global and local food safety regulations.
Sodium Tripolyphosphate Chemical Properties
| Property | Value |
| Melting Point | 622 °C (lit.) |
| Refractive Index | 1.478 |
| Storage Condition | Below 30°C, sealed & dry |
| Solubility | Freely soluble in water; insoluble in ethanol |
| Appearance | White crystalline powder / granules, odorless |
| pH (100 g/L, 20°C) | 9.2–10.1 |
| Aqueous Solubility | 150 g/L (25°C) |
| Characteristic | Slightly hygroscopic |
| Stability | Stable; incompatible with strong acids, prone to hydrolysis in acid |
| CAS No. | 7758-29-4 |
| Density | 2.52 g/cm³ |
Safety Information
| Item | Value |
| Hazard Symbol | Xi |
| Risk Phrases | 36/37/38 |
| Safety Phrases | 26-36 |
| WGK (Germany) | 1 |
| RTECS | YK4570000 |
| Flammability | Non-flammable |
| TSCA Listed | Yes |
| HS Code | 2835310000 |
This compound is commonly used as food-grade water retaining agent for meat products, seafood and frozen food, also used as food emulsifier, quality improver and softener. It can chelate metal ions to prevent food discoloration and deterioration. In addition, it is widely used in detergent industry, ceramic industry, water treatment agent, industrial dispersant and textile printing and dyeing auxiliary agent, covering multiple civilian and industrial application fields.
