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ISO 6791:1981
M00000150
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ISO 6791:1981 Carbonaceous materials for the production of aluminium -- Pitch for electrodes -- Determination of contents of quinoline-insoluble material
standard by International Organization for Standardization, 11/01/1981
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Specifies a conventional gravimetric method for the determination. A test portion ist reated with quinoline in a beaker at 70 to 80 C for 15 to 20 min. Then the dissolved test portion and the residue are brought to a Hartley funnel fitted with a filter pad, and are filtered. The washed and dried residue on the filter pad is weighed.