Sodium pyrophosphate

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White, crystalline powder that is used as a Buffer, Emulsifier, Sequestrant, and Water softener. Sodium pyrophosphate, or TSPP, is used in de-inking newsprint, removing rust stains, scouring Wool, and dyeing textiles. TSPP is also included as an ingredient in many soaps, detergents, and cleansers.

Synonyms and Related Terms

TSPP; tetrasodium pyrophosphate




  • Toxic by inhalation.
  • Contact may cause irritation.
  • ThermoFisher: SDS

Physical and Chemical Properties

Soluble in water. Decomposes in ethanol.

Composition Na4P2O7
CAS 7722-88-5
Melting Point 880 C
Density 2.45 g/ml
Molecular Weight mol. wt. = 266

Resources and Citations

  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 9377

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