Sodium formaldehyde bi-sulphite

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Sodium Formaldehyde Bisulfite (Bisulphite) is also known chemically as Sodium hydroxymethane sulfonate, CH2 (OH) SO3Na. The appearance of SFB is White, Shining, Crystalline free flowing powder , water-soluble which forms colorless and odorless solutions. used as a preservative in cosmetic compositions. The sodium hydroxymethane sulfonate is used to improve the color stability of rosin resins and it has properties of both formaldehyde and sodium bisulfite. It is typically present in an amount of from 0.05% to 5.0%, preferably about 0.25%, based on the weight of the rosin resin.
Sodium hydroxymethane sulfonate, is a white, water-soluble rather inexpensive powder which forms colorless and odorless solutions. Under alkaline conditions this compound is believed to slowly hydrolyze into formaldehyde and sodium bisulfite which by their presence render the desired antibacterial and antioxidant preservative properties, respectively. A preservative aqueous cosmetic composition having an antioxidant and an antibacterial property imparted by a single component is, therefore, obtained by treating the cosmetic composition with a sufficient amount of sodium hydroxymethane sulfonate to exert a preservative effect to the cosmetic formulation when the pH of the formulation is about 7.0 or higher.

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