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See Chinese contents: GB/T 3780.5-2017 GB/T 3780.5-2017: Carbon black -- Part 5: Determination of specific surface area -- CTAB test method
This Part of GB/T 3780 specifies a test method for the determination of the external surface area of carbon black using cetyltrimethylammonium bromide (CTAB). This Part is applicable to the carbon black for rubber.
