The Types segment classifies Sodium Sulfite Anhydrous by purity grade and intended end‑use, primarily into industrial‑grade, pharmaceutical‑grade, and food‑grade categories. Industrial‑grade material, typically ≥ 99 % purity, dominates the market because it satisfies the performance thresholds for water‑treatment, pulp‑and‑paper, and metal‑finishing applications; its lower cost structure contributes roughly 70 % of total sales volume. Pharmaceutical‑grade sodium sulfite, meeting USP‑NF specifications with tighter impurity limits, is employed as an antioxidant and reducing agent in injectable formulations and ophthalmic solutions, accounting for an estimated 20 % of the market. Food‑grade sodium sulfite, approved by FDA and EU regulations for use as a preservative and bleaching agent in processed foods, represents the remaining 10 % of demand. The relative pricing, regulatory compliance, and supply‑chain logistics of each type directly influence adoption rates, making the type‑based taxonomy a critical determinant of overall market dynamics. Supply constraints on high‑purity grades can shift buyers toward lower‑cost industrial variants, thereby reshaping the competitive landscape across geographic regions.