Chemical preparations for scientific purposes, other than for medical or veterinary use; Chemical preparations for analyses in laboratories, other than for medical or veterinary purposes; Diagnostic preparations for research laboratory use; Caustic alkali; Chromic salts; Radioactive elements for scientific purposes; Catalyst supports; Biochemical catalysts; Catalysts for oxidation processes; Catalysts for chemical and biochemical processes; Cryogenic preparations in solid, liquid or gas state...