Harmonized System
Section XVIII > Chapter 90 > Heading 9020
Other breathing appliances and gas masks, excluding protective masks having neither mechanical parts nor replaceable filters.
Section VI > Chapter 31 > Heading 3102
Mineral or chemical fertilisers, nitrogenous.
Section VI > Chapter 28 > Heading 2811
Other inorganic acids and other inorganic oxygen compounds of non-metals.
Section VI > Chapter 28 > Heading 2827
Chlorides, chloride oxides and chloride hydroxides; bromides and bromide oxides; iodides and iodide oxides.
Section VI > Chapter 28 > Heading 2825
Hydrazine and hydroxylamine and their inorganic salts; other inorganic bases; other metal oxides, hydroxides and peroxides.
Section VI > Chapter 28 > Heading 2833
Sulphates; alums; peroxosulphates (persulphates).
Section VI > Chapter 28 > Heading 2830
Sulphides; polysulphides, whether or not chemically defined.
Section VI > Chapter 28 > Heading 2832
Sulphites; thiosulphates.
Section VI > Chapter 28 > Heading 2821
Iron oxides and hydroxides; earth colours containing 70 % or more by weight of combined iron evaluated as Fe2O3.
Section VI > Chapter 28 > Heading 2822
Cobalt oxides and hydroxides; commercial cobalt oxides.