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 Acetylene black 28 03 00 20 Acetylene black Commodity Code Description 28 03 00 20 00 Acetylene black