Pyrophosphoric Acid 85%
Pyrophosphoric acid (H4P2O7) at 85% concentration is a viscous liquid used in organic synthesis and as a catalyst. Falls under HTS 2811.19.61.90 as an other inorganic acid, a condensed phosphorus oxyacid not elsewhere specified. Chemically defined per Chapter 28 notes.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If upon dehydration to diphosphorus pentaoxide
Heating or concentration converts to P2O5, classified in 2809.20 per specific heading.
If as salts like sodium pyrophosphate
Metal salts of pyrophosphoric acid fall under 2835 phosphonates per salt headings note.
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Import Tips & Compliance
• Submit molecular structure confirmation to differentiate from orthophosphoric acid
• Handle as UN 1803 corrosive; use HDPE drums with secondary containment
Related Products under HTS 2811.19.61.90
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.
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.