H 9770 (OTTO) Hafnium(IV) carbide, <1.25 μm Cas 12069-85-1 - used for preparation of ultra-high temperature ceramics. H 9770 (OTTO) Hafnium(IV) carbide, <1.25 μm Cas 12069-85-1 - used for Reactant in synthesis of hafnium-containing organometallic polymers