Sodium Tripolyphosphate
| Formula: | Na₅P₃O₁₀ |
| CAS Number: | 7758-29-4 |
| EC Number (EINECS): | 231-838-7 |
| HS Code: | 28354000 |
| UN Number: | Not classified |
| IUPAC Name: | Pentasodium triphosphate |
| Also Known As: | Sodium Tripolyphosphate; STPP; Pentasodium Triphosphate |
| Molecular Weight, g/mol: | 367.86 |
Typical Specifications
| Appearance: | White crystalline powder |
| Odor: | Odorless |
| Melting Point, °C: | 622 (decomposes) |
| Boiling Point, °C: | Decomposes before boiling |
| Density, g/cm³ (at 20°C): | 2.539 |
| pH (1% solution): | 9.5–10.5 |
| Purity, %: | ≥94 |
| Grades Available: | Industrial, Food Grade (FCC) |
| Packaging: | 25kg bags, 500kg jumbo bags, bulk |
Applications / Uses
Primary Applications
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Water softening agent in detergents and cleaning products
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Sequestering agent in water treatment
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Ingredient in ceramic, textile, and paper industries
Secondary Applications
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Used as emulsifier and dispersing agent in food processing
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Raw material in the production of phosphoric acid derivatives
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Additive in metal finishing and textile bleaching
End Industries Served: Detergents & Cleaning, Water Treatment, Food Processing, Ceramics, Textiles, Paper, Metal Finishing
Safety & Handling Information
Hazard Class (GHS): Not classified as hazardous; may cause mild irritation
Hazard Statements (H-Codes):
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H319: Causes serious eye irritation (dust)
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H335: May cause respiratory irritation (dust)
Precautionary Statements (P-Codes):
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P261: Avoid breathing dust
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P280: Wear protective gloves/eye protection
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P305 + P351 + P338: IF IN EYES – rinse cautiously with water, remove contact lenses if present
Storage Conditions
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Store in a cool, dry, ventilated place
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Keep container tightly closed
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Avoid moisture and contamination
Transport Information
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ADR/RID: Not classified as dangerous goods
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IMDG: Not classified as dangerous goods
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IATA: Not classified as dangerous goods