Sodium Bisulfite is an inorganic sulfur-containing cosmetic ingredient used in selected personal-care formulations for its reducing, antioxidant and preservative functions. Its INCI name is SODIUM BISULFITE. It is identified by CAS No. 7631-90-5, with the chemical formula NaHSO₃ and molecular weight of approximately 104.06 g/mol.
Sodium Bisulfite is also known as Sodium Hydrogen Sulfite, Sodium Hydrogensulfite, Sodium Bisulphite and Sodium Acid Sulfite. The material is commonly encountered as a white crystalline or granular solid and may also be supplied commercially as an aqueous solution. Because sulfite materials can change composition through oxidation and equilibrium reactions, the exact physical form and commercial specification should be clearly defined.
Sodium Bisulfite belongs to the sulfite family that also includes Sodium Sulfite, Sodium Metabisulfite and Potassium Metabisulfite. Although these ingredients have related chemical behavior, they have different molecular compositions and should be specified separately.
Sodium Bisulfite is represented by the chemical formula NaHSO₃. Its chemistry is associated with sulfur dioxide and bisulfite ions in aqueous systems. The material is highly water-compatible and is used where controlled reducing or sulfite functionality is required.
For technical quality control, Sodium Bisulfite is generally characterized using parameters such as sulfur-dioxide equivalent, pH, insoluble matter and elemental impurities. A conventional organic-compound HPLC assay should not automatically be assigned to this material.
A commonly referenced specification expresses Sodium Bisulfite assay as 58.5–67.4% sulfur dioxide equivalent. Because commercial Sodium Bisulfite can exist in equilibrium with related sulfite species, assay should be linked to the validated analytical method used for the actual grade.
Sodium Bisulfite can perform multiple functions in cosmetic formulations. Its reducing properties allow it to participate in chemical systems where controlled reduction is required. Its antioxidant functionality can help reduce oxidation of susceptible formulation components.
It is also used as part of preservation systems in appropriate formulations. The practical performance depends on pH, concentration, formulation composition and the presence of other oxidizing or reducing substances.
Sodium Bisulfite is particularly relevant to certain hair-treatment applications. Reducing agents can be used in hair-waving and hair-straightening systems to modify chemical bonds involved in the hair structure. The finished formulation must be designed according to the specific process and regulatory requirements.
Sodium Bisulfite Cosmetic Ingredient can be considered for:
Its application level should always be determined from the finished formulation and the intended regulatory category.
Sodium Bisulfite is sensitive to oxidation and should be protected from unsuitable storage conditions. Exposure to air and inappropriate environmental conditions can change sulfite chemistry and affect raw-material quality.
The pH of the material is an important technical parameter. A commonly referenced specification gives a pH of 2.5–4.5 for a 1-in-10 aqueous solution. This should be treated as a reference specification rather than a universal limit for every commercial cosmetic grade.
Because Sodium Bisulfite is highly water-soluble, it can be incorporated into suitable aqueous formulation systems. However, compatibility with other ingredients should be assessed during formulation development.
Sodium Bisulfite is a specialty cosmetic ingredient and personal-care raw material for formulations requiring reducing, antioxidant or sulfite-based functionality. Commercial customers may require defined purity, sulfur-dioxide equivalence, pH, impurity controls and batch-level technical documentation.
For B2B procurement, relevant search terms include Sodium Bisulfite Cosmetic Ingredient Manufacturer in India, Sodium Bisulfite Supplier India, Sodium Bisulfite Manufacturing in India, Sodium Bisulfite Cosmetic Raw Material Supplier, Sodium Bisulfite Personal Care Ingredient Supplier and Bulk Sodium Bisulfite Ingredient Supply.
The physical form should also be clearly defined because solid Sodium Bisulfite and concentrated Sodium Bisulfite solutions can have very different commercial specifications.
| Parameter | Specification |
|---|---|
| Appearance | White or colourless crystals / white powder |