STPP/Sodium Tripolyphosphate
STPP Chemical: Versatile compound used as a detergent builder and water softener.
Sodium Tripolyphosphate
- CAS Number: 7758-29-4
- EINECS NO.: 231-838-7
- Molecular Formula: Na5P3O10
- Purity (%): 90%,94%
- Types: food grade, industrial grade, water treatment grade
- Appearance: white granular or powder.
- Packing: 25kgs/bag, or as customers' requirement.
- Other Name: Pentasodium triphosphate; Sodium triphosphate; STPP; pentasodium salt of triphosphoric acid
Sodium Tripolyphosphate Specification
| ITEMS | SPECIFICATIONS |
| Main content | ≥90% |
| P2O5 | ≥57% |
| Water insoluble | ≤0.07% |
| Fe | ≤0.01% |
| PH value of 1% solution | 9.2-10.0 |
| Whiteness | ≥90% |
| Size (1.0mm) | ≥95% |
| ITEMS | SPECIFICATIONS |
| Main content | ≥94% |
| P2O5 | ≥57% |
| Water insoluble | ≤0.07% |
| Fe | ≤0.01% |
| PH value of 1% solution | 9.2-10.0 |
| Whiteness | ≥90% |
| Size (1.0mm) | ≥95% |
| ITEMS | SPECIFICATIONS |
| Main content | ≥90% |
| P2O5 | ≥57% |
| Water insoluble | ≤0.07% |
| Fe | ≤0.01% |
| PH value of 1% solution | 9.2-10.0 |
| Whiteness | ≥90% |
| Size (1.0mm) | ≥95% |
| ITEMS | SPECIFICATIONS |
| Main content | ≥85% |
| P2O5 | 56%-58% |
| Water insoluble | ≤0.1% |
| Fluoride(F) | ≤50ppm |
| Arsenic, as As | ≤3ppm |
| Heavy metal, as Pb | ≤10ppm |
| Lead ,Pb | ≤4ppm |
Sodium Tripolyphosphate for Sale
| Feature | Powder Form | Granular Form |
| Dissolution Speed | Very fast – dissolves quickly due to larger surface area | Slower – dissolves steadily, good for controlled release |
| Caking Tendency | Higher – absorbs moisture easily, may clump | Lower – resists caking, better for humid storage |
| Flowability | Poor – can be dusty, may stick | Excellent – flows freely, ideal for automated systems |
| Best For | • Meat and seafood processing • Water treatment chemicals • Paper and textile industries • Rapid mixing applications | • Detergent and cleaning powder production • Industrial cleaners • Bulk blending operations • Automatic dosing systems |
Key Advantages of Sodium Tripolyphosphate (STPP)
Powerful Water Softening: STPP effectively binds calcium and magnesium ions in hard water, improving cleaning performance and preventing scale buildup in equipment and pipes.
Excellent Detergent Builder: It enhances the cleaning power of surfactants, suspends dirt to prevent redeposition, and acts as an anti-caking agent in powder detergents.
pH Buffering Capacity: STPP maintains optimal alkaline conditions (pH 9-10) in cleaning solutions, helping to remove acidic soils and stabilize formulations.
Food Quality Enhancer: In meat, seafood, and poultry processing, STPP improves moisture retention, texture, and tenderness while reducing drip loss during storage and cooking.
Versatile Industrial Applications: Widely used in water treatment, ceramics (as a dispersant), textile dyeing, metal treatment, and as a corrosion inhibitor in pipelines.
What is Sodium Tripolyphosphate Used for
Detergents: Acts as a builder/chelating agent to prevent redeposition and soften hard water.
Food Industry: Regulates pH and enhances texture in meats, seafood, dairy, and canned foods.
Water Treatment: Prevents scale and deposits in boilers and cooling systems to maintain efficiency.
Ceramics: Serves as a dispersant and deflocculant to improve slurry flow and reduce viscosity.
Metal Treatment: Functions as an emulsifier in degreasers, rust removers, and plating baths.
General Industry: Controls water hardness and aids dispersion in oil drilling, textiles, and paper.
FAQ of Sodium Tripolyphosphate
Yes, food-grade STPP is generally recognized as safe (GRAS) by the FDA when used according to regulations . It is commonly used as a preservative, emulsifier, and moisture retention agent in seafood, meats, and poultry.
Food grade STPP has stricter purity requirements with lower limits for heavy metals (arsenic ≤0.0003%, lead ≤0.0004%) and is safe for food processing. Industrial grade has slightly lower purity (≥94%) but the same basic chemical properties.
We provide full documentation including Commercial Invoice, Packing List, Certificate of Analysis (CoA), Material Safety Data Sheet (MSDS), and customs export declaration. STPP is generally not regulated as dangerous goods for transport.
STPP is stable under normal conditions but is incompatible with strong oxidizing agents and strong acids . Avoid mixing with these substances.
STPP is available in standard 25kg bags or customized packaging to meet client requirements.Store in a cool, dry, well-ventilated area and keep bags tightly sealed to prevent moisture absorption and caking.
Store in a cool, dry, well-ventilated area and keep bags tightly sealed to prevent moisture absorption and caking.
Sodium Tripolyphosphate Supplier
HOOCHEMTEC: Your Trusted Partner for Sodium Tripolyphosphate (STPP)
We are a direct manufacturer and experienced exporter of high-quality Sodium Tripolyphosphate, with our own production facility ensuring consistent supply and strict quality control for customers worldwide.
Complete Product Range:
We supply STPP in both powder and granular forms, available in food grade and industrial grade to meet your specific application needs. Powder dissolves quickly for fast reactions, while granules flow freely for automated production lines. All grades meet international standards for purity and performance.
Quality You Can Count On:
Every batch is tested in our laboratory. We provide Certificate of Analysis (CoA) with each shipment, confirming active content, pH value, and heavy metal limits. No guesswork — just reliable quality batch after batch.
Global Export Expertise:
With years of experience shipping to customers across Asia, the Middle East, Africa, and the Americas, we understand international logistics. STPP is non-hazardous, making shipping straightforward. We handle all documentation — commercial invoices, packing lists, MSDS, and customs clearance — professionally.
Free Samples Available:
Contact us to request a free sample of your preferred STPP form and grade for testing before placing bulk orders.
Choose HOOCHEMTEC for quality STPP and a partnership you can trust from factory to your door.
