Kaolin Clay: Functional Optical Additives PCI Mag
#0183;#32;Kaolin clay is commonly differentiated as quot;hardquot; clay or quot;soft,quot; according to terminology borrowed from the rubber industry. Hard clay is relatively poorly crystallized, very finegrained kaolin, about to #230;m median particle size by sedimentation. It provides reinforcement in rubber, resulting in hard, uncured compounds.