Sodium Sulfites

Sodium sulfite is a versatile inorganic chemical used as an oxygen scavenger in boiler water treatment, a preservative in photographic processing, and a reducing agent in pulp and paper manufacturing. The entire heading maps to a single tariff line (2832100000), so classification is straightforward, but purity specifications and intended end-use can affect admissibility review when the compound is destined for food or pharmaceutical applications. Italy and Canada are the leading foreign sources of US imports, with India, China, and Thailand also supplying the market.