Hi-Black 40B2 Carbon black Degussa Extenders / Fillers >> Carbon black Pigments >> Carbon Black SEALANT Hi-Black 40B2 Conductive Carbon black; This product is a specialty carbon black for coloring, electro-conductive/antistatic and UV protection Used as a pigment in caulks for interior and exterior applications and in expansion joints. Conductive carbon black. Used as a pigment in caulks for interior and exterior applications and in expansion joints. Provides coloring, electro-conductive/antistatic and UV protection.