Categories

CN2810

28 Inorganic Chemicals, Organic or Inorganic Compounds of Precious Metals, of Rare-earth Metals, of Radioactive Elements or of Isotopes

2810 (01/1988-..) Oxides of Boron, Boric Acids

28100000 (01/1988-12/1996) Oxides of Boron, Boric Acids

28100010 (01/1997-..) Diboron Trioxide

28100090 (01/1997-..) Oxides of Boron and Boric Acids (Excl. Diboron Trioxide)