AL2O3 Content% ¡Ý30.5 ¡Ý38.5

Water Absorption% ¡Ü0.20 ¡Ü0.30 ¡Ü0.25

Cohesiveness of glaze 1000Heat insulation 2hours no cement 1300Heat insulation 30min no cement

Acid resistance of glazemg/cm2Total surface area

Lose¡Ü0.01

Thermal stability 950 to room temperature cool on the asbestos board, three times no bursting. 1000to roomtemperature cool on the asbestos board three times no bursting.

Air-tightness Keep 10min under one atmospheric pressure, pressure fall ¡Ü3%

Plability 1300bending no more than0.5%

Carbon content% ¡Ü0.02