Section 06 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 isotopes 28 03 Carbon (carbon blacks and other forms of carbon, nes) 28 03 00 Carbon (blacks and other forms of carbon not elsewhere specified or included). 28 03 00 00 Carbon (blacks and other forms of carbon not elsewhere specified or included). Commodity Code Description 28 03 00 00 000 Carbon (blacks and other forms of carbon not elsewhere specified or included).