... .7 mm0,028 inSpec. area825 m²/m³251.4ft²/ft³Void fraction64%64% Physical dataNameUnitAlumina PorcelainMullit porousCordieriteDenseCordierite PorousQuartz PorcelainDensityg/ ... /ft³57.5 51,953,741.942,5Average heat Expansion coefficient10-6 K-16,26,23,53,44,810-6 °F ... 2430,203Heat conductivityW/mK2,502,421,891,631,5BTU in/ft² hr°F17,316,813,111,310.4Temperature changeResistancemax K500550500600500max ...