Product Category: Detergent Raw Materials / Water Treatment / Industrial Phosphates
Chemical Name: Sodium Tripolyphosphate
Alternative Names: STPP / Sodium Triphosphate
CAS Number: 7758-29-4
Chemical Formula: Na₅P₃O₁₀
Molecular Weight: 367.86 g/mol
Appearance: White powder or granules
Product Overview
Sodium Tripolyphosphate is an industrial phosphate widely used as a detergent builder, water-softening agent, sequestrant, dispersant and processing aid.
STPP binds calcium and magnesium ions and improves cleaning performance in detergent and industrial-cleaning formulations.
Typical Technical Grade Specification
| Property | Typical Reference |
| SKU | MCS-S16 |
| STPP Assay | ≥94% |
| P₂O₅ | ≥57% |
| Water Insolubles | ≤0.10% |
| Iron | ≤0.01% |
| pH — 1% Solution | Approx. 9.2–10.0 |
| Whiteness | ≥90% typical |
| Formula | Na₅P₃O₁₀ |
| CAS Number | 7758-29-4 |
These values are representative of commercial technical-grade STPP.
Applications
- Powder detergents
- Industrial cleaning compounds
- Water softening
- Scale control
- Ceramic processing
- Textile processing
- Leather processing
- Paper manufacturing
- Dispersing systems
Key Benefits
- Effective hardness sequestration
- Improves detergent performance
- Helps reduce scale
- Good dispersing properties
- Strong detergent-builder functionality
Storage
Store in a dry area and protect from humidity, as STPP can absorb moisture and cake.
