... heat exchange media,ceramic honeycombs ,materials are mainly utilized in heat recovery unit of RTO 40X40 ChannelsChemical composition (WT%)chemical componentsAlumina PorcelainMullit ... 832860670680lb/ft³57.5 51,953,741.942,5Average heat Expansion coefficient10-6 K-16,26,23,53,44,810- ... 2210,2430,203Heat conductivityW/mK2,502,421,891,631,5BTU in/ft² hr°F17,316,813,111,310.4Temperature changeResistancemax ...