Chemical Name Sodium Propyl 4-Hydroxybenzoate
    Molecular Formula C10H11NaO3
    Molecular Weight 202.18
    Structural Formula  
    CAS Number 35285-69-9
    Packing 5 Kg, 20kg(4 x 5 kg)
    The Shelf-life 5 years
    Storage conditions and precautions Store in a well-closed containers.
    Use Antimicrobial Preservative


    NO. Test Observation
    1. Description A white, crystalline powder, odourless or almost odourless; hygroscopic.
    2. Solubility Freely soluble in water and in ethanol (50%), sparingly soluble in ethanol (95%), practically in soluble in fixed oils.
    3. Identifiction A. Dissolve 0.5 gm in 5 ml of water and acidify to litmus paper with hydrochloric acid; a white precipitate is produced. Wash the precipitate with water and dry. The infrared absorption spectrum of the precipitate, appendix 5.4 is concordant with the reference spectrum of Propyl Paraben or with the spectrum obtained from Propyl Paraben RS.
    B. The precipitate obtained in test A on ignition gives the reactions of sodium salts, appendix 3.1
    4. PH Between 9.5 to 10.5, determined in a 0.1% w/v solution, appendix 8.11
    5. Appearance of solution A 10% solution in water is clear, 10% solution in water is clear, or not more opalescence than Opalescence standard OS1 prepared by 5.0 ml of Opalescence standard & 95 ml of water .
    6. Chlorides Not more than 330 ppm
    7. Sulphate Not more than 0.12%
    8. Water Not more than 5.0%
    9. Assay on dried basis (as C10H11NaO3) Between 99.0% to 102.0%


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