Sodium Tripolyphosphate (STPP) is the most widely used and versatile functional polyphosphate raw material globally, available in two primary grades: food-grade and industrial-grade. Appearing as a uniform white powder, it features excellent water solubility, strong chelating capabilities, superior dispersibility, and outstanding buffering stability. It serves as a core raw material across various sectors, including food moisture retention and quality improvement, household and industrial detergents, water softening, ceramic dispersion, and the printing, dyeing, and papermaking industries.
Our company consistently exports high-purity STPP that meets national standards. Manufactured using an advanced thermal-process phosphoric acid synthesis method, our product boasts high purity, minimal impurities, excellent whiteness, superior flowability, resistance to caking, and exceptional batch-to-batch consistency. The product fully complies with international export standards and supports third-party verification (such as SGS); we provide complete documentation for customs clearance. We maintain long-term, high-volume supplies to markets in Southeast Asia, Africa, the Middle East, South America, Europe, and the Americas, making it a high-demand, best-selling raw material for the export of chemicals, food additives, and industrial auxiliaries.
Complete Basic Product Specifications
| Product Name | Sodium Tripolyphosphate |
| CAS Number | 7758-29-4 |
| Molecular Formula | Na₅P₃O₁₀ |
| Molecular Weight | 367.86 |
| E-Number | E451(i) |
| Appearance | Pure white crystalline powder/granules; uniform, translucent color; free from impurities or black specks |
| Odor | Completely odorless; free from pungent or volatile off-odors |
| Aqueous Solution | Clear and transparent; free from suspended matter, sediment, or turbidity |
Content Grade
1. Food Grade: Main content ≥98.5%, P₂O₅ ≥57.0%; complies with FCC, USP, EP, and national standards for food additives.
2. Industrial Grade: Main content options of 94%, 95%, or 96%; features high whiteness and excellent dispersibility, suitable for various industrial additive applications.
Key Physicochemical Indicators
pH (1% aqueous solution): 9.2–10.0 (weakly alkaline; excellent buffering capacity)
Water-insoluble matter: ≤0.1% (minimal residue; prevents equipment clogging and separation/sedimentation)
Whiteness: ≥92%–94%
Thermal stability: High-temperature resistant; stable at ambient temperature; resistant to moisture absorption and hydrolysis
Bulk density: Customizable (high or low density) to suit various customer filling and mixing processes
Safety and Hygiene Indicators (Exclusively for Food-Grade Exports)
Heavy metals (lead, arsenic) and fluoride are strictly controlled.
Total bacterial count and pathogenic bacteria were not detected.
Free from solvent residues and harmful impurities; compliant with global safety standards for food-contact materials.
Production Process and Quality Advantages
Low-end STPP products on the market often rely on simple wet-process methods, suffering from issues such as yellowish color, high impurity levels, hygroscopicity (leading to clumping), slow dissolution, unstable chelation values, batch-to-batch color inconsistency, and turbid aqueous solutions. These flaws frequently result in poor detergent performance, excessive moisture loss in meat processing, ceramic slurry stratification, scaling in water treatment systems, and shipment rejections due to failure to meet overseas inspection standards.
Our export-grade STPP is produced using a high-end line featuring thermal-process phosphoric acid polymerization, multi-stage impurity removal, and spray drying. Six key process advantages ensure superior export quality:
High-Purity, Controlled Raw Materials
We use premium-grade thermal phosphoric acid as the base material. With extremely low impurity levels, we eliminate heavy metals, salt residues, and insoluble matter at the source; our food-grade product is suitable for direct use in high-end fresh food processing for export.
Precision Polymerization
Production utilizes a fully automated closed-loop system controlling temperature, pressure, and pH. This ensures a uniform and stable degree of polymerization, with consistent chelation, dispersion, and water-retention capabilities across batches-ideal for the standardized mass-production formulas of overseas clients.
Multi-Stage Purification
We incorporate four specialized filtration stages to remove fluorine, arsenic, heavy metals, and residual salts. Our food-grade specifications fully align with international export standards, passing comprehensive re-inspections by SGS, the FDA, and other third-party agencies.
Spray-Drying Formation
The resulting powder is loose and fine with excellent flowability and low hygroscopicity. It resists clumping and caking even in the high-temperature, high-humidity conditions of long-distance ocean shipping, ensuring the product arrives in perfect condition for seamless mixing and processing.
Highly Stable Physicochemical Properties
The product offers excellent thermal and storage stability and resists hydrolysis-induced degradation. Performance remains consistent during long-term storage-unlike cheap, low-end alternatives that quickly lose effectiveness.
End-to-End Quality Control and Traceability
Production takes place in a Class 100,000 clean environment. Each batch undergoes independent testing and sample retention with transparent, verifiable data, ensuring stable, long-term delivery for international trade.
Industry-wide Application Scenarios for STPP
Food Processing Industry (Food-grade STPP)
Applications: Frozen meat, seasoned beef and lamb products, quick-frozen seafood (shrimp/fish fillets), hot pot meatballs, sausage and cured meat products, canned foods, fruit and vegetable preservation, dairy products, and quality improvement for sauces and broths.
Core Functions: Water retention and weight gain; tenderizing and enhancing texture; locking in freshness and color; improving mouthfeel; extending shelf life.
Detergent and Personal Care Industry (Industrial-grade STPP)
Applications: Laundry powder, liquid detergent, industrial cleaners, soap, soap powder, degreasers, and detergent additives for hard water.
Core Functions: Softening water to boost performance; chelation for stain removal; emulsification for degreasing; preventing soil redeposition; enhancing the cost-performance ratio of finished detergent products.
Water Treatment Industry
Applications: Industrial circulating water, boiler water, municipal sewage, and hard water softening/pretreatment agents.
Core Functions: Scale inhibition and prevention; water quality stabilization; protecting pipelines and equipment from scaling and corrosion.
Ceramics Industry
Applications: Ceramic slurry and glaze dispersants.
Core Functions: Reducing slurry moisture content; improving fluidity; increasing body density; reducing defects; enhancing the surface finish and yield rate of finished ceramic products.
Textile Printing & Dyeing, Papermaking, and Leather Industries
Applications: Leveling agents for printing and dyeing; dispersants for paper fillers; softening agents for leather pre-tanning.
Core Functions: Enhancing production process stability and the texture/quality of finished products.
Petroleum Drilling and Chemical Coatings
Applications: Drilling mud stabilizers; pigment dispersants for coatings; industrial suspension aids.
Core Functions: Ensuring system uniformity and preventing sedimentation.
Packaging and Storage Parameters
1. Standard export packaging: 25kg paper-plastic composite bags with a food-grade PE waterproof inner liner
2. Sample packaging: 500g/1kg individual vacuum-sealed bags
3. Storage conditions: Store in a cool, dry, and well-ventilated warehouse; keep sealed and protected from direct sunlight and moisture
4. Shelf life: 24 months (unopened, under standard storage conditions)
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