Chemical Name Sodium Methyl 4-Hydroxybenzoate
    Molecular Formula C8H7NaO3
    Molecular Weight 174.13
    Structural Formula  
    CAS Number 5026-62-0
    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 White, hygroscopic powder.
    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 Methyl 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 non-luminous flame.
    4. PH Between 9.5 and 10.5, determined in a 0.1% w/v solution, appendix 8.11
    5. Water Not more than 5.0 %
    6. Chloride Not more than 0.035 %
    7. Sulphate Not more than 0.12 %
    8. Organic volatile impurities. Method-I <467>. Meets the requirements.
    9. Assay on dried basis (As C8H7NaO3) Not less than 98.5% and not more than 101.5%


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