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); 28 15 20 POTASSIUM HYDROXIDE (CAUSTIC POTASH) Commodity Code Description 28 15 20 00 POTASSIUM HYDROXIDE (CAUSTIC POTASH)