Food-Grade Phosphate

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  • Sodium Acid pyrophosphate

    Molecular Formula: Na₂H₂P₂O₇
    Molecular Weight: 221.939
    CAS Number: 7758-16-9
    EINECS Number: 231-835-0
    Customs Code: 28353990
    Alias: SAPP

    Characteristics:

    • White powder or white granules
    • Relative density: 1.1
    • Soluble in water, insoluble in ethanol
    • Aqueous solution hydrolyzes into phosphoric acid when heated with dilute inorganic acids
    • Hygroscopic, forms a hexahydrate upon absorbing moisture
    • Decomposes into sodium metaphosphate when heated above 220°C
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  • Tetrasodium pyrophosphate

    Molecular Formula: Na₄P₂O₇
    Molecular Weight: 265.9
    CAS Number: 7722-88-5
    EINECS Number: 231-767-1
    H.S. Code: 28353990
    Alias: Tetrasodium Pyrophosphate, Sodium Pyrophosphate, TSPP

    Characteristics:

    • White powder
    • Soluble in water, insoluble in alcohol
    • Relative density: 2.45
    • Melting point: 890°C
    • Aqueous solution is weakly alkaline and hygroscopic in air
    • Aqueous solution is stable at 70°C, hydrolyzes to disodium phosphate upon boiling
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