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Sodium Tripolyphosphate (STPP), Powder, Food Grade, Kosher

Multi-functional food-grade preservative and water softening agent.

SKU: STPP_LT
Sodium Tripolyphosphate, Food grade, Kosher
Sodium Tripolyphosphate - Versatile Detergent Component and Food Preservative

Versatile detergent component and food preservative.

SKU: STPP_M
Sodium Tripolyphosphate (STPP), Powder, Food Grade, Kosher (STPP_LT)

Sodium Tripolyphosphate (STPP), Powder, Food Grade, Kosher


Sodium Tripolyphosphate (STPP), also known as Sodium Triphosphate or Pentasodium Tripolyphosphate, is a food-grade compound widely used in industrial, commercial, and food applications. In detergents, it serves as a water softener and builder by chelating calcium and magnesium ions, ensuring optimal detergent performance in hard water. In food production, STPP is used as a preservative for seafood, meats, and poultry, retaining moisture and improving texture. It is listed as E number E451 and approved by the FDA as "generally recognized as safe." Beyond food uses, it functions as an emulsifier, sequestering agent, and deflocculating agent in ceramics and soaps. Available in granular, low-density form, this versatile product is offered in 50-lb bags or repacked smaller quantities.


Key Features

  • Food-grade, Kosher-certified preservative
  • Effective water softener and detergent builder
  • Retains moisture in seafood, meats, and poultry
  • FDA-approved as E451 and "generally recognized as safe"
  • Applications in ceramics, soaps, and industrial uses
  • Low-density granular powder with low toxicity

Product Specifications

Chemical Name Sodium Tripolyphosphate
CAS Number 7758-29-4
Chemical Formula [Na₅P₃O₁₀]n
Purity Food Grade
Applications Food preservative, water softening, detergent builder, ceramics
Trade Names CARFOSEL 408


Perfect for food, detergent, and industrial applications.
SKU: STPP_LT
Sodium Tripolyphosphate - Versatile Detergent Component and Food Preservative
Sodium Tripolyphosphate, Food grade, Kosher (STPP_M)

Sodium Tripolyphosphate (Food Grade, Kosher)


Sodium tripolyphosphate, also known as sodium triphosphate or STPP, is mainly consumed as a component of commercial detergents. It serves as a builder or water softener, particularly in hard water containing high concentrations of magnesium and calcium ions. In such conditions, detergents can be deactivated. However, STPP, being a highly charged chelating agent, tightly binds to calcium and magnesium ions, preventing their interference with sulfonate detergent performance.

STPP is not only used in detergents but also serves as a preservative for seafood, meats, poultry, and animal feeds. In the food industry, it is commonly known as E451 and finds usage as an emulsifier and moisture retainer. Many governments regulate the quantities allowed in foods, as STPP can substantially increase the sale weight of seafood. The United States Food and Drug Administration recognizes STPP as "generally recognized as safe."

Sodium tripolyphosphate is available in low density, medium density, and high-density granular powders. The specific product being described here is a medium density variant. It is categorized as food (FCC) grade, granular, medium density, and Kosher-certified. Besides its primary uses in water softening and as a sequestering agent, STPP can also function as a peptizing or deflocculating agent. Furthermore, it has applications in detergents, soaps, and ceramics.

The chemical structure of sodium tripolyphosphate is [Na5P3O10]n. It is also known by synonyms such as sodium triphosphate, triphosphoric acid pentasodium salt, sodium phosphate tripoly, STPP, pentasodium triphosphate, and pentasodium tripolyphosphate. The product is packaged in 50-lb bags by the original manufacturer, while smaller quantities are repacked for laboratory, research, and industrial uses. The CAS number for sodium tripolyphosphate is [7758-29-4][Na5O10P3]n.

Sodium tripolyphosphate exhibits low toxicity, making it a safe choice for various applications.


Key Features:

  • Effective detergent component and water softener
  • Chelating agent that prevents interference with sulfonate detergents
  • Preservative for seafood, meats, poultry, and animal feeds
  • Emulsifier and moisture retainer in food production
  • Regulatory compliance and recognized as safe by FDA

Product Specifications:

Chemical Structure[Na5P3O10]n
SynonymsSodium triphosphate; Triphosphoric acid, pentasodium salt; Sodium Phosphate Tripoly; STPP; pentasodium triphosphate; Pentasodium Tripolyphosphate
GradeFood (FCC) Grade, Granular, medium density, Kosher
UsesWater softening, sequestering, peptizing or deflocculating agent. May also be used for detergents, soaps, and ceramics.
CAS #[7758-29-4][Na5O10P3]n

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Note: These are similar products, and each product is different, so research is required to find the best fit for your needs.

Caution: Sodium tripolyphosphate is generally safe for use as directed. However, individuals with specific allergies or sensitivities should exercise caution and consult a healthcare professional if necessary.


Perfect for detergent manufacturers, food producers, and industries seeking versatile water softeners, preservatives, and chelating agents.
SKU: STPP_M
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