Ceramic seal faces have the property of the resistant-high-temperature,resistant-corrosion,resistant-wearing and good sealing and are widely used in spacecraft,machinery,metallurgy,printing and dyeing, foodstuff,pharmaceutical, auto industry and so on.
AI2O3 Ceramic physical property
Technical Parameter	Unit	95%	99%	99.50%
Content of Al2O3	%	95	99	99.5
Density	g/cm3	3.7	3.88	3.9
Hardness	HRA	85	88	90
Porosity Rate	%	<0.4	<0.2	<0.15
Fractural Strength	Mpa	250	310	350
Coefficient of Heat Expansion	10-6/K	5.5	5.3	5.2
Thermal Conductivity	W/M.K	27.8	26.7	26