Section 05 Mineral products 25 Salt; sulphur; earths and stone; plastering materials, lime and cement 25 28 Natural borates and concentrates; natural boric acid 25 28 00 Natural borates and concentrates thereof.....calculated on the dry weight 25 28 00 00 Natural borates and concentrates thereof.....calculated on the dry weight Commodity Code Description 25 28 00 00 000 Natural borates and concentrates thereof.....calculated on the dry weight