Chapter 2831 — Customs Tariff Headings
Subheadings
Products classified under Tariff item 28.31
Industrial Sodium Hydrosulfite Substitute Rongalite
> Industrial Sodium Hydrosulfite Substitute Rongalite is a stable, free-flowing powder of sodium formaldehyde sulfoxylate, used as a reducing agent in bleaching and dechlorination processes for pulp and textiles. It is a separate chemically defined inorganic compound of sodium, meeting the scope of Chapter 28 Note 1(a). It falls under tariff item 2831.10.00 as a sulphoxylate of sodium.
2831.10.00Rongalite C Technical Grade
> Rongalite C Technical Grade is a commercial form of sodium formaldehyde sulfoxylate, supplied as a white, free-flowing powder for industrial vat dyeing. As a chemically defined sodium sulphoxylate, it is classified under tariff item 2831.10.00. The technical grade does not alter its identity as a separate compound.
2831.10.00Sodium Dithionite 88% Technical Grade
> Sodium Dithionite 88% Technical Grade is sodium dithionite (Na2S2O4), also known as sodium hydrosulfite, in powder form for industrial textile bleaching and vat dyeing. It is a separate chemically defined inorganic compound of sodium, meeting Chapter 28 Note 1(a). It is classified under tariff item 2831.10.00 as a dithionite of sodium.
2831.10.00Sodium Dithionite Flakes Industrial
> Sodium Dithionite Flakes Industrial is a flaked form of sodium dithionite for easier handling in wastewater treatment and food processing decolorization. As a chemically defined sodium dithionite, it is classified under tariff item 2831.10.00. The flake form does not affect its classification as a separate compound.
2831.10.00Sodium Dithionite for Dyeing 90% Min
> Sodium Dithionite for Dyeing 90% Min is a high-purity sodium dithionite with a minimum 90% assay, used for indigo dyeing in denim production. It is a separate chemically defined compound of sodium, meeting Chapter 28 Note 1(a). It falls under tariff item 2831.10.00 as a dithionite of sodium.
2831.10.00Sodium Formaldehyde Sulfoxylate 99% Pure Crystals
> Sodium Formaldehyde Sulfoxylate 99% Pure Crystals is a high-purity crystalline compound used in chemical synthesis and as a bleaching assistant in paper manufacturing. It is a separate chemically defined compound of sodium, satisfying Chapter 28 Note 1(a). It is correctly classified under tariff item 2831.10.00 as a sulphoxylate of sodium.
2831.10.00Sodium Formaldehyde Sulfoxylate Dihydrate Powder
> Sodium Formaldehyde Sulfoxylate Dihydrate Powder is a white crystalline powder with the chemical formula NaHSO2·CH2O·2H2O, used as a reducing agent in textile dyeing and bleaching. As a hydrate of a sodium sulphoxylate, it is a separate chemically defined compound under Chapter 28 Note 1(a). It falls under tariff item 2831.10.00.
2831.10.00Sodium Hydrosulfite Powder 85%
> Sodium Hydrosulfite Powder 85% is a technical-grade sodium hydrosulfite with an 85% assay, used for pulp bleaching and as a mordant in leather processing. As a chemically defined sodium dithionite, it is classified under tariff item 2831.10.00. The product meets Chapter 28 Note 1(a) as a separate compound.
2831.10.00Technical Sodium Sulfoxylate Dihydrate
> Technical Sodium Sulfoxylate Dihydrate is sodium sulfoxylate dihydrate (NaHSO2·2H2O), used in polymer synthesis and as a bleach in the paper industry. It is a separate chemically defined compound of sodium, meeting Chapter 28 Note 1(a). It is classified under tariff item 2831.10.00 as a sulphoxylate of sodium.
2831.10.00Textile Dyeing Rongalite Auxiliary Chemical
> Textile Dyeing Rongalite Auxiliary Chemical is a specialty formulation of sodium formaldehyde sulfoxylate in powdered form, used for discharge printing on textiles. Despite the trade name, it is a chemically defined sodium sulphoxylate, not a preparation, and is classified under tariff item 2831.10.00. The product meets Chapter 28 Note 1(a) as a separate compound.
2831.90.00Ammonium Dithionite Solution
> Ammonium dithionite in aqueous solution acts as a reducing bleach for textiles and paper. As a chemically defined inorganic compound of dithionite, it falls under tariff item 2831.90.00 for other dithionites and sulphoxylates. The aqueous solution is a normal method of putting up for safety and transport, consistent with Chapter 28 Note 1.
2831.90.00Potassium Dithionite
> Potassium dithionite is a strong reducing agent used in chemical synthesis and wastewater treatment. As a chemically defined inorganic salt of dithionite, it is classified under tariff item 2831.90.00 for other dithionites. It is not organically stabilized and meets Chapter 28 Note 1 criteria.
2831.90.00Sodium Dithionite
> Sodium dithionite, also known as sodium hydrosulfite, is a white crystalline powder used as a reducing agent in textile bleaching and vat dyeing. It is a chemically defined inorganic compound and falls under tariff item 2831.90.00 as 'other' dithionites, since it is not specifically named in the subheading.
2831.90.00Sodium Formaldehyde Sulfoxylate
> Sodium formaldehyde sulfoxylate is a sulfoxylate reducing agent used in polymerizations and dye discharge printing. It is a chemically defined inorganic compound, and as a sulfoxylate it falls under tariff item 2831.90.00 for other dithionites and sulphoxylates. The product is not organically stabilized in a way that excludes it from Chapter 28.
2831.90.00Zinc Dithionite
> Zinc dithionite is an inorganic salt used in industrial reducing applications, particularly in pulp and paper bleaching. As a chemically defined dithionite, it falls under tariff item 2831.90.00 for other dithionites. It meets Chapter 28 Note 1 requirements as a separate chemical compound.