Standard Classification of Goods (SCG) 2000

• VI - Products of the chemical or allied industries
• 28 - Inorganic chemicals; organic or inorganic compounds of precious metals, of rare-earth metals, of radioactive elements or of isotopes

2850 - Hydrides, nitrides, azides, silicides and borides, whether or not chemically defined, other than compounds which are also carbides of heading No. 28.49