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  • Sodium Tripolyphosphate (STPP)
  • Sodium Tripolyphosphate (STPP)
  • Sodium Tripolyphosphate (STPP)
  • Sodium Tripolyphosphate (STPP)
  • Sodium Tripolyphosphate (STPP)

Sodium Tripolyphosphate (STPP)

Sodium tripolyphosphate (STPP, Na₅P₃O₁₀) is a white powder or granules, readily soluble in water, and its aqueous solution is alkaline. It is produced by the high-temperature polymerization of sodium dihydrogen phosphate and disodium hydrogen phosphate. Its core uses include detergent additives, food additives (water retention, flavor enhancement), and scale inhibitors in water treatment. It is also used in papermaking, printing and dyeing, and other fields. Storage requires sealing and moisture protection, keeping it away from acids and alkalis, and avoiding dust contact during handling.
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Product Parameters

Items for detecting and analyzing

Standard value
Grade IGrade IIGrade III
Whiteness                                                                                                                 %≥908580
Main content sodium tripolyphosphate (Na5P3O10)                              %≥96.090.085.0
Phosphorus pentoxide (P2O5)                                                                                                                              %≥57.056.5
55.0
Water insoluble                                                                                                       %≤0.100.100.15
lron (as Fe)                                                                                                                %≤0.0070.0150.030
pH (1%)9.2~10.0
Chemical granularityThe screening rate of 1.00mm testscreen is not less than 95%

Basic Properties

Basic Characteristics

STPP's properties determine its wide range of applications. Its main characteristics are as follows:


Chlorination:

This is STPP's most important property. It can form stable, soluble complexes with metal ions in water (such as calcium (Ca²⁺), magnesium (Mg²⁺), iron (Fe²⁺), etc.).

Effect: Softens hard water and prevents metal ions from adversely affecting products (such as detergents and food) (e.g., precipitation, discoloration, oxidation).

Dispersing:

STPP enhances the dispersibility of solid particles and greases in water, preventing redeposition.

Effect: In detergents, it prevents dirt from re-adhering to fabrics; in industries such as ceramics, it prevents raw materials from clumping.

Emulsifying:

It helps emulsify greases into tiny droplets, which are stably dispersed in water.

Effect: Improves the detergent's ability to remove oil stains.

Buffering Effect:

Aqueous solutions of STPP have good acid-base buffering capacity, maintaining the system's pH within a suitable alkaline range (typically pH 9.5-10).

Effect: Provides and maintains an optimal alkaline environment for the washing process, improving detergency.

Protein Solubilizing Effect:

It increases the solubility of proteins in foods such as meat, promoting moisture retention.

Effect: Widely used in meat processing to maintain the tenderness and juiciness of meat.

Hygroscopicity:

Anhydrous STPP readily absorbs moisture from the air and undergoes hydrolysis, producing orthophosphates. Therefore, it needs to be stored in a dry environment.

Main Applications


1. Synthetic Detergent Industry (Primary Use)

STPP was once called the "cornerstone of detergents." Although its use is restricted in some countries and regions due to environmental considerations (eutrophication), it remains an important detergent builder globally.

Functions:

* **Water Softening:** Chelates calcium and magnesium ions in water, preventing them from reacting with surfactants to form insoluble substances, thus improving washing performance.

* **Dirty Dispersion:** Prevents washed-off dirt from redepositing on clothes, keeping them white.

* **Alkalinity:** Enhances the removal of acidic stains.

* **Oil Emulsification:** Improves oil removal ability.


2. Food Industry (As a Food Additive)

In food, STPP is used as a quality improver, moisture retainer, and pH adjuster. Its food-grade designation is typically E451(i).

Application Examples:

* **Meat Products:** Used in ham, sausages, fish balls, canned goods, etc. It improves the water-holding capacity of meat, making the product more tender, juicy, and increasing yield.

Seafood Processing: Used in freezing fish and shrimp to reduce juice loss during thawing and maintain shape and flavor.

Dairy Products: Used in cheese, etc., as an emulsifier and stabilizer.

Beverages: Used as a clarifying and stabilizing agent for fruit juices and beverages.


3. Industry and Water Treatment

Industrial Cleaning: Used in metal surface treatment, boiler descaling, and as a bleaching stabilizer in the paper industry.

Water Treatment: Used as a corrosion inhibitor and scale inhibitor to prevent scaling and corrosion in pipes and equipment.

Oil Extraction: Used as a dispersant for drilling mud.

Ceramics Industry: Used as a mud diluent to improve its fluidity.

Textile Printing and Dyeing: Used as a dyeing aid and bleaching auxiliary.

Safety Precautions


1. Health: Low toxicity; safe for use in food when used according to regulations, but should not be used in excessive amounts.


2. Environment: The main risk is eutrophication of water bodies; therefore, its use in detergents is strictly limited.

Company Profile

Junteng Chemical is a professional chemical raw materials trading company dedicated to providing customers with one-stop procurement services. Through strict supplier, supply chain, and after-sales management, the company ensures that product quality, transportation, and use meet customer needs. Furthermore, the company's technical team offers customized solutions and support services free of charge.

 

The company has projects in the pharmaceutical, pesticide, petrochemical, construction, food additives, wastewater treatment, adhesives, inks, paints, coatings, plastic and rubber processing, detergent raw materials, fertilizer and textile mills, and more. Junteng Chemical sources products of stable and reliable quality, collaborating with domestic and international companies such as Luxi Group, Weiyuan Chemical, Qilu Petrochemical, Dongying Lihuayi, Yanshan Petrochemical, Sinopec, Shijiazhuang Refinery, Qingdao Petrochemical, Sailboat, Dow Chemical, BASF, South Korea, Taiwan, and Saudi Arabia. Our stable supply, superior product quality, and mature logistics have earned us a wide clientele. We look forward to collaborating with all of you for a mutually beneficial future.

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Company advantages

1

One-Stop Procurement
Platform

We integrate resources across all productcategories, including organic solvents,resins and rubbers, and inorganicchemicals,and strictly control suppliers.supply chains, and after-sales processes toensure stable quality, efficienttransportation,and worry-free use,simplifying your procurement process.

2

Professional Team TechnicalEmpowerment

Equipped with an experienced technicalteam, we provide free personalizedsolutions and professional technicalsupport to customers in varlous industrie,such as pharmaceuticals, petrochemicals,coatings and inks, and sewage treatment,.helping you solve problems and improveefficiency.

3

Global supply ChainSecurity

We work with top domestic and foreignchemical giants such as Luxi Group, QiluPetrochemical, Sinopec, BASF of Germany,and Dow of the United States to establisha stable and reliable high-quality supplynetwork and a mature logistics system toensure timely and safe delivery of
products.

4

Deep Win-Win CooperationConcept

Adhering to the concept of "integrity.immediate action, professionalism,innovation and win-win" and taking"customer success and altruism" as ourmission, we are committed to establishinglong-term strategic partnerships andcreating a better future through excellentproducts and services.

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