the physical and chemical proposions: Bulk densityParticle sizecompressive strenthSpecific electrical resistanceElastic modulusCoefficient of thermal expansionAsh(g/cm3)(mm)(Mpa)(μΩm)(Gpa)(10-6/degree)(%)≥1.682≥28≤8.5≤9.3≤2.9≤0.3≥1.680.8≥25≤7.8≤9.3≤2.9≤0.3≥1.582.0≥18≤10.5≤9.3≤2.9≤0.3≥1.720.8≥30≤7.5≤9.3≤2.9≤0.3