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Harmonized System
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)
Section VI > Chapter 28 > Heading 2811 > 2811.2 > 2811.21
Carbon dioxide
Section VI > Chapter 28 > Heading 2811 > 2811.2 > 2811.22
Silicon dioxide
Section VI > Chapter 28 > Heading 2812
Halides and halide oxides of non-metals.