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 15 Sodium hydroxide (caustic soda); potassium hydroxide (caustic potash); peroxides of sodium or potassium. 28 15 30 Peroxides of sodium or potassium 28 15 30 00 Peroxides of sodium or potassium Commodity Code Description 28 15 30 00 000 Peroxides of sodium or potassium