Cenosphere fly ash is one of the best filling materials for paint, printing ink, carbon, fiber, GRP, leatheroid, rubber plastic ... cenosphere is one of the best filling materials for paint, printing ink, carbon, fiber, GRP, leatheroid, rubber, ... in the filler industry today that can meet the requirements for low shrinkage.6.LOWTHERMAL,ELECTRICAL,AND SOUNDCONDUCTIVITY: cenospheres are ...