This standard specifies an inspection method for non-carbon black substances contained in various carbon blacks that cannot pass through a 850 μm (20 mesh) sieve. This standard is applicable to the inspection of impurities contained in rubber carbon black, acetylene carbon black, pigment carbon black, etc.
GB/T 3780.12-1995 history
2007GB/T 3780.12-2007 Carbon black Part12:Inspection of impurity material