Chemical Name Sodium Propyl 4-Hydroxybenzoate
    Molecular Formula C10H11NaO3
    Molecular Weight 202.2
    Structural Formula  
    CAS Number 35285-69-9
    Packing 5 kg, 20 kg ( 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 White powder. Is odorless and hygroscopic.
    2. Solubility Freely soluble in water; sparingly soluble in alcohol; insoluble in fixed oils.
    3. Identification A. Dissolve 0.5 gm in 5 ml of water, acidify with hydrochloric acid; and filter the resulting precipitate. Wash the precipitate with water and, dry it over silica gel for 5.0 hrs: The infrared absorption spectrum of a mineral oil dispersion of it exhibits maxima only at the same wavelengths as that of a similar preparation of usp Propyl Paraben RS.
    B. Ignite about 0.3 gm, cool, and dissolve the residue in about 3 ml of 3N hydrochloric acid. A platinum wire dipped in this solution imparts an intense, persistent yellow colour to a nonluminous flame.
    4. PH Between 9.5 to 10.5 (1 gm in 1000 ml)
    5. Water Not more than 5.0 %
    6. Chlorides Not more than 0.035 %.
    7. Sulphate Not more than 0.12%.
    8. Organic volatile impurities Method-I < 497 > meets the requirements.
    9. Assay on dried basis (As C10H11NaO3) Not less than 98.5% and not more than 101.5%


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