ISO 5938-1979 Cryolite, Natural and artificial, and aluminium fluoride for industrial use - Determination of sulphur content - X-ray fluorescence spectrometric method

ISO 5938-1979 amd 1980 ISO 5937-1980 Sodium Perborates for Industrial Use - Determination of Degree of Attrition ISO 5936-1980 Crude Sodium Borates for Industrial Use - Determination of Carbonate Content - Gravimetric Method ISO 5939-1980 Carbonaceous Materials for the Production of Aluminium - Pitch for Electrodes - Determination of Water Content - Azeotropic Distillation (Dean and Stark) Method ISO 5940-1-2019 CARBONACEOUS MATERIALS FOR THE PRODUCTION OF ALUMINIUM - PITCH FOR ELECTRODES - PART 1: DETERMINATION OF SOFTENING POINT BY THE RING-AND-BALL METHOD ISO 5940-2-2007 Carbonaceous materials used in the production of aluminium — Pitch for electrodes — Part 2: Determination of the softening point (Mettler softening point method)