Hypophosphorous Acid 50% Solution
Hypophosphorous acid (H3PO2) 50% aqueous solution serves as a reducing agent in chemical synthesis and electroless plating. It is classified in HTS 2811.19.61.90 as an other inorganic phosphorus oxyacid. Excluded from Chapter 28 note 2 only for specific carbon compounds, qualifying as chemically defined.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If specified as phosphorous acid (H3PO3)
Phosphorous acid has dedicated subheading 2811.19.2050; misidentification shifts classification within 2811.
If as sodium hypophosphite salt
Sodium or other metal salts of hypophosphorous acid classify under 2835 per heading 2826-2842 salt note.
If sold as plating bath preparation
Formulated for specific end-use like electroless nickel plating becomes chemical preparation in 3824.
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Import Tips & Compliance
• Include phosphorous content lab test results to avoid confusion with phosphorous acid (H3PO3) in same subheading
• UN 2835 hazardous; require spill containment plans in shipping manifests
• Avoid pitfall of classifying as 'phosphite' salts, which go to 2835; confirm free acid form
Related Products under HTS 2811.19.61.90
Boric Acid Powder Technical Grade
Technical grade boric acid (H3BO3) powder used in ceramics, herbicides, and antiseptics. Although subheading 2810.00 covers boric acid primarily, purer technical grades or specific forms may fall under 2811.19.61.90 as other inorganic oxygen compounds.
Germanium Dioxide Hydrated (Germanic Acid)
Hydrated germanium dioxide, or germanic acid (H2GeO3), used in fiber optics and catalysts. Falls under HTS 2811.19.61.90 as other inorganic germanium oxyacid.
Silicic Acid Precipitated
Precipitated silicic acid (H2SiO3 gel) used as anti-caking agent and absorbent. Classifies in HTS 2811.19.61.90 as other inorganic acid of nonmetal silicon. Distinct from silica in 2811.22.
Arsenic Acid Solution 70%
Arsenic acid (H3AsO4) 70% solution is used in wood preservatives and glass manufacturing. Classified in HTS 2811.19.61.90 as an other inorganic oxyacid of nonmetal arsenic. Qualifies under Chapter 28 for chemically defined inorganic acids.
Antimonic Acid Colloidal
Colloidal antimonic acid (HSbO3·nH2O) is applied in flame retardants and catalysts. It is an other inorganic acid under HTS 2811.19.61.90, oxygen compound of nonmetal antimony. Chemically defined despite colloidal form.
Phosphoric Acid 85% Technical Grade
Phosphoric acid (H3PO4) at 85% concentration is a clear, colorless liquid used in fertilizers, detergents, and food processing. It falls under HTS 2811.19.61.90 as an other inorganic acid, specifically a phosphorus oxyacid not classified elsewhere in heading 2811. This classification applies to its chemically defined inorganic nature per Chapter 28 notes.