Section 06 Products of the chemical or allied 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 (carbon blacks and other forms of carbon, nes) Commodity Code Description 28 03 00 00 Carbon (carbon blacks and other forms of carbon, nes) 28 03 00 20 Acetylene black 28 03 00 41 Of a kind used for rubber processing 28 03 00 49 Other 28 03 00 90 Other