Sodium Tripolyphosphate (STPP), chemically known as Pentasodium Triphosphate with the formula Na₅P₃O₁₀, is a versatile inorganic salt used extensively in industrial cleaning, water treatment, and ceramic manufacturing.
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Looking for manufacturer specifications, bulk packaging (25kg/1000kg), or current factory pricing?
👉 Visit our Industrial Grade Sodium Tripolyphosphate (STPP) Product Page directly.
Chemical Properties & Specifications
Produced by the reaction of phosphoric acid with soda ash, STPP stands out for its exceptional chelating ability, making it a powerful “water softener” in industrial applications.
| Property | Specification |
|---|---|
| Chemical Name | Sodium Tripolyphosphate (STPP) |
| Chemical Formula | Na₅P₃O₁₀ |
| CAS Number | 7758-29-4 |
| Appearance | White Powder or Granules |
| pH Value (1% solution) | 9.2 – 10.0 (Alkaline) |
| Purity | 94% Min / 95% Min |
Need detailed technical data? You can download the full TDS (Technical Data Sheet) and MSDS on our STPP Manufacturer Page.
Quick Comparison: STPP vs. SHMP vs. TSPP
Choosing the right phosphate depends heavily on your specific application requirements. Below is a technical comparison to help you select the right product for your production line.
| Feature | STPP | SHMP | TSPP |
|---|---|---|---|
| Full Name | Sodium Tripolyphosphate | Sodium Hexametaphosphate | Tetrasodium Pyrophosphate |
| pH Value | 9.2 – 10.0 (Alkaline) | 5.8 – 7.3 (Neutral) | 10.0 – 10.8 (High Alkaline) |
| Primary Function | Builder & Chelating Agent | Dispersant & Scale Inhibitor | Buffer & Emulsifier |
| Best Application | Detergents, Ceramics | Water Treatment, Refractory | Toothpaste, Electroplating |
| View Product | Check STPP Price | Check SHMP Price | Check TSPP Price |
💡 Key Takeaways for Buyers:
- Need a Detergent Builder? Go with STPP. Its ability to sequester Calcium/Magnesium makes it the industry standard for washing powders.
- Need a Dispersant? Go with SHMP. Its long-chain structure makes it superior for keeping particles suspended in ceramic slurries.
- Need a Strong Buffer? Go with TSPP. It is ideal for electroplating and food emulsification.
Key Industrial Applications
1. Detergents and Cleaning Agents
The majority of global STPP consumption is attributed to the detergent industry. It acts as a primary “builder” in synthetic detergents. By binding heavy metal ions in water (like Ca2+ and Mg2+), it prevents them from neutralizing the surfactant, thus maximizing cleaning efficiency. It also prevents dirt from re-depositing on fabrics.
2. Ceramic Production
In the ceramic industry, Industrial Grade STPP is indispensable. It is used as a highly effective degumming agent and synthetic water-reducing agent.
Goway Chemical’s Advantage: Our STPP allows ceramic manufacturers to reduce the water content in the slurry process by up to 15% while maintaining fluidity. This directly results in significant energy savings during the spray drying tower process.
3. Water Treatment
Due to its strong chelating ability, STPP is used to control water hardness and prevent scale formation in industrial boilers and pipes.
Food Grade vs. Industrial Grade: What’s the Difference?
While chemically similar, Food Grade STPP and Industrial Grade STPP are produced under different hygiene standards. The key difference lies in the content of heavy metals such as Arsenic (As) and Lead (Pb).
- Food Grade: Used as a preservative and moisture-retaining agent in seafood, meats, and poultry. It must meet FCC/E451 standards.
- Industrial Grade: Focused on cleaning efficiency, particle size distribution, and bleaching capabilities.
Note: If you require food-grade certification (HALAL/KOSHER), please visit our Food Additives STPP Section.
Frequently Asked Questions (FAQ)
What is the HS Code for Sodium Tripolyphosphate?
The HS Code (Harmonized System Code) for Sodium Tripolyphosphate (STPP) is generally 2835.31. When importing, please confirm with us for the exact 10-digit code applicable to your destination country.
Is Sodium Tripolyphosphate safe?
Yes, STPP is generally recognized as safe (GRAS) by the FDA when used in accordance with Good Manufacturing Practices. In industrial applications, standard safety equipment (gloves, masks) should be worn to avoid dust inhalation. For detailed safety handling, refer to our MSDS.
What is the difference between STPP and SHMP?
The main difference is pH and solubility. STPP is alkaline (pH 9.2-10) and is a better builder for detergents. SHMP is neutral (pH 5.8-7.3) and serves as a superior dispersant and scale inhibitor in water treatment.
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