Harmonized System
Section VI > Chapter 28 > Heading 2809
Diphosphorus pentaoxide; phosphoric acid; polyphosphoric acids, whether or not chemically defined.
Section VI > Chapter 28 > Heading 2809 > 2809.10
Diphosphorus pentaoxide
Section VI > Chapter 28 > Heading 2809 > 2809.20
Phosphoric acid and polyphosphoric acids
Section VI > Chapter 28 > Heading 2810
Oxides of boron; boric acids.
Section VI > Chapter 28 > Heading 2810 > 2810.00
Oxides of boron; boric acids
Section VI > Chapter 28 > Heading 2811
Other inorganic acids and other inorganic oxygen compounds of non-metals.
Section VI > Chapter 28 > Heading 2811 > 2811.1
Other inorganic acids
Section VI > Chapter 28 > Heading 2811 > 2811.2
Other inorganic oxygen compounds of non-metals
Section VI > Chapter 28 > Heading 2811 > 2811.1 > 2811.11
Hydrogen fluoride (hydrofluoric acid)
Section VI > Chapter 28 > Heading 2811 > 2811.1 > 2811.12
Hydrogen cyanide (hydrocyanic acid)