Sodium Formaldehyde Sulfoxylate
Sodium formaldehyde sulfoxylate (NaHSO2·CH2O) is a sulfoxylate reducing agent used in polymerizations and dye discharge printing. Classified in HTS 2831.90.00.00 as 'other' sulfoxylates when meeting inorganic compound criteria despite formaldehyde association. Technical grade powder or dihydrate form common.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If commercially available as stabilized Rongalite grades
Sulfoxylates stabilized with organic substances explicitly in 2831.10.
If formaldehyde adduct dominates organic character
Saturated acyclic organic compounds with sulfur function in Chapter 29.
If technical grade mixtures with >10% water/binders
Not 'chemically defined' per Chapter 28 note; becomes preparation.
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Import Tips & Compliance
• Distinguish from Rongalite C (stabilized form) via molecular analysis for correct subheading
• Store refrigerated; import with validity date <6 months from manufacture
• REACH registration required for EU re-export; provide exposure scenarios
Related Products under HTS 2831.90.00.00
Sodium Dithionite
Sodium dithionite (Na2S2O4), also known as sodium hydrosulfite, is a white crystalline powder used as a reducing agent in textile bleaching and vat dyeing processes. It falls under HTS 2831.90.00.00 as one of the 'other' dithionites specified in the chapter notes for Chapter 28. This chemically defined inorganic compound is stabilized for industrial use but classified here rather than under organic-stabilized variants.
Zinc Dithionite
Zinc dithionite (ZnS2O4) is an inorganic salt used in industrial reducing applications, particularly in pulp and paper bleaching. Classified under HTS 2831.90.00.00 as 'other' dithionites, it meets Chapter 28 requirements for chemically defined inorganic sulfur-oxygen compounds. Its metal salt nature distinguishes it from organic-stabilized forms.
Potassium Dithionite
Potassium dithionite (K2S2O4) serves as a strong reducing agent in chemical synthesis and wastewater treatment. It is categorized under HTS 2831.90.00.00 for other dithionites, as a chemically defined inorganic compound per Chapter 28 Note 1. Primarily supplied as technical grade powder for industrial applications.
Ammonium Dithionite Solution
Ammonium dithionite (NH4)2S2O4 in aqueous solution acts as a reducing bleach for textiles and paper. Falls under HTS 2831.90.00.00 as 'other' dithionites when chemically defined and not organically stabilized. Concentration typically 20-40% active ingredient for liquid handling.