Specification
| Product Name | Sodium Tripolyphosphate |
|---|---|
| Other Names | STPP |
| CAS No. | 7758-29-4 |
| EINECS No. | 202-830-0 |
| MF | Na5O10P3 |
| Molecular weight | 367.86 |
| Purity | 96% |
| Appearance | White powder-like |
| Density | 2.52 g/cm3 (20 °C) |
| water solubility | 20 g/100 mL (20 ºC) |
| melting point | 622 °C |
| vapour pressure | <0.1 hPa (20 °C) |
Values are typical for the standard grade. Tighter specifications are available — state the target in your inquiry and we confirm against the production batch.
Packaging and shipping
Trisodium phosphate is an important inorganic condensation phosphate salt. It was widely used as a “standard additive” in the production of detergents. Although its use in the detergent industry has been restricted under the global environmental protection trend, its outstanding ability to chelate metal ions, buffering effect, dispersion and emulsification, as well as water retention and oil retention properties, make it still play an indispensable role in numerous specialized fields such as the food industry, industrial water treatment, ceramic dispersion, and metal cleaning. We are committed to providing compliant and professional products and services to help customers achieve performance optimization and cost control in specific processes.
Product Description
Anhui Eapearl Chemical Co., Ltd.As a professional supplier of petrochemical raw material supply chain, leveraging a profound understanding of the polyester industry chain and strong resource integration capabilities, we are committed to providing our customers with stable and reliable p-xylene (PTA) products and market solutions. PTA is the world’s largest producer of binary aromatic acids and is the core raw material for producing polyethylene terephthalate (PET). It is hailed as the “food” of modern textile, packaging and material industries. Its high purity, large-scale continuous production, and efficient condensation with ethylene glycol (EG) make it a cornerstone bulk organic raw material connecting petrochemicals with daily consumer goods (textile fibers, beverage packaging) and high-end manufacturing (films, engineering plastics). We are dedicated to providing stable supply, professional services, and precise market perception to become a reliable strategic partner in your polyester production system.
The core value of PTA lies in its unique and irreplaceable role as a diacid monomer in polyester synthesis. Its performance directly determines the quality of the final polyester product.
High purity and high quality: Modern PTA industrial products (fiber grade) typically have a purity of ≥ 99.9% (measured by acid value), and key impurities such as 4-carboxylbenzaldehyde (4-CBA) and p-methylbenzoic acid (p-TA) are controlled at the ppm level, which directly affects the molecular weight, color (b value), and processability of the polyester.
High reactivity: High-purity PTA can undergo efficient direct esterification and polycondensation reactions with ethylene glycol (EG), which is a technical prerequisite for modern continuous, large-scale polyester production facilities (such as the Jima and DuPont processes).
Industrial scale and cost advantages: The global annual consumption exceeds 100 million tons, and China’s production capacity dominates globally. Large-scale, integrated production brings significant cost and supply stability advantages.
The core value of sodium tripolyphosphate lies in its multiple functions as an efficient multi-valent chelating agent, buffer, and quality improver. Although its main application scenarios have changed, these functions remain significant.
Outstanding chelation (softening) ability: It can strongly bind metal ions such as calcium, magnesium, iron, and copper in water, preventing their adverse effects, which is the basis for its use as a water softener and scale inhibitor.
Good buffering effect: It can stabilize the pH value of the system and provide an appropriate alkaline environment.
Dispersion and emulsification effect: It can break emulsions, disperse solid particles, and has a certain ability to emulsify fats. Water and oil retention property: In food processing, it can enhance the water retention capacity of proteins, improve product yield and texture.
Delivery&Payment method
Frequently asked
In what packaging is Sodium Tripolyphosphate shipped?
Standard formats are Dag (25kg), IBC Dag (25kg), ISO tank (20ft) (24–26 m³), ISO tank (40ft) (48–50 m³). Other packaging can be arranged for full-container orders.
Is a safety data sheet available for Sodium Tripolyphosphate?
Yes, on request. Safety data sheets are issued per grade and destination market; state the country of import in your inquiry.
What purity do you supply?
The standard grade is 96%. Tighter specifications are confirmed against the production batch before shipment.
