25kg Per Bag CAS 7758-29-4 Sodium Tripolyphosphate STPP For Water Treatment
Product Specifications
| Attribute | Value |
| CAS | 7758-29-4 |
| EINECS | 231-838-7 |
| Appearance | White powder |
| Crystalline hydrate | No Water crystals |
| Life span | Two years |
| Status | Chemical materials |
| PH | 9~10 |
Technical Specifications
Molecular formula: Na5P3O10
Molecular weight: 367.86
Industrial Grade Specifications (GB/T 9983-2004 Standard)
| Parameter | Standard Value |
| Main content: sodium tripolyphosphate ≥ | 96.0% |
| Phosphorus pentoxide P2O5 ≤ | 57.0% |
| Water insoluble ≤ | 0.10% |
| Fluoride (as F) ≤ | 0.007% |
| Ph Value (1%) | 9.2-10.0 |
| Whiteness ≥ | 90 |
Food Grade Specifications (QB 1034-1991 Standard)
| Parameter | Standard Value |
| Main content: sodium tripolyphosphate ≥ | 95.0% |
| Phosphorus pentoxide P2O5 ≤ | 57.0% |
| Water insoluble ≤ | 0.05% |
| Fluoride (as F) ≤ | 0.003% |
| Heavy metal (as Pb) ≤ | 0.001% |
| Arsenic (as As) ≤ | 0.0003% |
| Sulphate (as SO4) ≤ | 0.4% |
| Chlorine (as Cl) ≤ | 0.025% |
| Ph Value (1%) | 9.5-10.0 |
| Whiteness ≥ | 85 |
References: Riel Chemical Lab1&2, National public service platform for standards information.
Performance Characteristics
- White granular or powder with density of 0.35-0.90 g/cm³ and melting point of 622°C
- Easily soluble in water with alkaline aqueous solution (pH 9.7 for 1% solution)
- Gradually hydrolyzes into phosphite in water with excellent metal ion complexation ability
- Forms soluble complexes with calcium, magnesium, iron and other metal ions
- Acts as an inorganic surfactant with properties similar to organic surfactants
Applications
- Synthetic detergent additive and soap agent to prevent grease precipitation and frosting
- Strong emulsifying effect on lubricating oil and fat
- Industrial water softener for tanning, pre-tanning, and dyeing processes
- Dispersant for paints, kaolin, magnesium oxide, calcium carbonate, and drilling mud
- Anti-oil agent in paper industry
Water Treatment Applications
Primary Functions in Water Treatment
- Scale inhibitor: Chelates calcium and magnesium ions to prevent scaling in boilers and cooling systems
- Corrosion inhibitor: Forms protective film on metal surfaces to slow corrosion
- Dispersant: Prevents particle deposition in industrial circulating water and RO membrane pretreatment
Advantages and Limitations
Advantages:
- Cost-effective solution with strong chelating capability
- Effective for medium and low hardness water
- Combines corrosion inhibition and dispersion effects
Limitations:
- Environmental concerns due to phosphorus content (restricted in some regions)
- Effectiveness decreases above 80°C due to decomposition
- Requires precise dosage control to avoid residue issues
Recommended Usage Scenarios
- Recommended for: Industrial cooling systems, small boiler water treatment, wastewater pretreatment
- Not recommended for: Areas with strict phosphorus bans, high-temperature (>80°C) systems, drinking water (unless food-grade)
Frequently Asked Questions
What is your payment term?
We accept T/T and L/C at sight as payment terms.
Are you able to deliver on time?
Yes, we specialize in this product line with many years of experience. Our customers choose us for reliable on-time delivery and consistent top quality.
Do you provide free samples?
Yes, we provide free samples with the customer responsible for express shipping fees.
How about the price? Can you make it cheaper?
Customer benefit is our top priority. Prices are negotiable based on order conditions, and we guarantee competitive pricing.
Can I visit your company and factory in China?
You are welcome to visit our facility in Weifang, China. We provide airport pickup and drop-off services at Weifang Airport.
What if there is a quality problem?
Our professional after-sales team promptly addresses all quality concerns to ensure complete customer satisfaction.
