CPV code 24311440 designates Hexafluorosilicic acid in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
24311440 is a leaf code — the most specific level of its branch — so it can be used directly as the main CPV code of a contract notice. If it does not quite fit, check the neighbouring codes under 24311400 (Hydrogen chloride, inorganic acids, silicon dioxide and sulphur dioxide).