Sodium Dithionites and Sulfoxylates

Sodium dithionite (sodium hydrosulfite) is a powerful reducing agent widely used in textile bleaching, paper pulp brightening, and food-grade applications, while sodium formaldehyde sulfoxylate serves as a discharge-printing agent in dyeing operations. The US tariff schedule separates sodium formaldehyde sulfoxylate (2831101000) from other sodium dithionites and sulfoxylates (2831105000). Germany and India are the leading suppliers, with Belgium, China, and Canada also contributing meaningfully to US import volumes. Importers should verify whether the specific compound triggers any Section 301 exposure, particularly for shipments originating from China.