Section 06 PRODUCTS OF THE CHEMICAL OR ALLIED INDUSTRIES 28 INORGANIC CHEMICALS; ORGANIC OR INORGANIC COMPOUNDS OF PRECIOUS METAL, OFRARE-EARTH METALS, OF RADIOACTIVE ELEMENTS OR OF ISOTOPES 28 15 SODIUM HYDROXIDE (CAUSTIC SODA); POTASSIUM HYDROXIDE (CAUSTIC POTASH); Commodity Code Description 28 15 11 SOLID SODIUM HYDROXIDE ( CAUSTIC SODA) 28 15 12 SODIUM HYDROXIDE (CAUSTIC SODA) IN AQUEOUS SOLUTION (SODA LYE/LIQUID SODA) 28 15 20 POTASSIUM HYDROXIDE (CAUSTIC POTASH) 28 15 30 PEROXIDES OF SODIUM OR POTASSIUM