Section 05 Mineral products 25 Salt, sulphur; earths and stone; plastering materials, lirne and cement 25 28 Natural borates and concentrates; natural boric acid Commodity Code Description 25 28 00 Natural borates and concentrates thereof (whether or not calcined), but not including 25 28 10 Natural sodium borates and concentrates thereof, whether or not calcined 25 28 90 Natural borates (excl. sodium) and concentrates; natural boric acid