What is Sodium Meta Bi Sulphite?
Sodium Metabisulphite (Na2S2O5) is an inorganic salt closely related to Potassium Metabisulphite, widely used as an antimicrobial preservative, antioxidant, and reducing agent across food, beverage, and industrial applications. It is a white to off-white crystalline powder that releases sulphur dioxide (SO2) gas when dissolved in water or exposed to acidic conditions, which is the basis of both its preservative action in food applications and its reducing/dechlorinating action in industrial uses.
Polychem Industries supplies Sodium Metabisulphite in food grade and industrial grade to winemakers, dried fruit processors, beverage manufacturers, water treatment companies, and textile bleaching operations across India and internationally. Its dual role as both an effective food preservative/antioxidant and a powerful industrial reducing agent makes it one of the most versatile sulphite compounds in commercial use.
Sulphite Sensitivity Notice
Sodium Metabisulphite releases sulphur dioxide, to which some individuals are sensitive or allergic, particularly those with asthma. Products containing sulphites above regulatory thresholds must be labelled accordingly. Handle in well-ventilated areas and avoid inhalation of dust or fumes.
Available Grades
| Grade | Form | Purity | Standard | Applications |
|---|---|---|---|---|
| Food Grade | White to off-white crystalline powder | ≥98% (Food Grade) | FSSAI / FCC / E223 | Wine making, dried fruit, food preservation, beverages |
| Industrial Grade | White to off-white powder | 97%+ | Industrial | Water treatment, dechlorination, textile bleaching, photography |
Applications & Uses
Wine Making & Fermentation Control
Used extensively in winemaking, similar to Potassium Metabisulphite, to inhibit unwanted wild yeast and bacterial growth, prevent oxidation, and stabilise wine quality during fermentation, ageing, and bottling.
Dried Fruits & Food Preservation
Widely used to preserve the colour and prevent microbial spoilage of dried fruits, helping maintain an appealing appearance and extending shelf life of dehydrated fruit products.
Beverage & Juice Preservation
Used as a preservative and antioxidant in fruit juices, cordials, and various beverage products to inhibit microbial growth and prevent oxidative browning and flavour degradation.
Water Treatment & Dechlorination
Industrial Grade Sodium Metabisulphite is widely used to remove residual chlorine from water in industrial processes, aquaculture, and certain water treatment applications, taking advantage of its strong reducing properties.
Textile Bleaching & Processing
Used as a reducing agent and anti-chlor in textile bleaching operations, helping neutralise residual chlorine after bleaching processes and contributing to certain textile finishing applications.
Photography & Industrial Reducing Agent
Used as a reducing agent in certain photographic processing applications and various industrial processes requiring a reliable source of sulphite-based reducing action.
Technical Specifications
Sodium Meta Bi Sulphite — Key Properties
Why Source Sodium Meta Bi Sulphite from Polychem Industries?
- Food Grade (E223) and Industrial Grade available with full documentation
- Certificate of Analysis available on request
- Effective antimicrobial, antioxidant and reducing agent across applications
- Reliable bulk supply for winemakers, food processors and water treatment companies
- Competitive pricing with consistent year-round availability
- Export documentation experience for international shipments
