They have the property of excellent resistant-corrosion, high mechanical strength, high thermal conductivity, good self-lubrication, used as seal faces, bearings and tubes in spacecraft, machinery, metallurgy, printing and dyeing, foodstuff, phamaceutical, auto industry and so on. When the sic faces are combined with graphite faces the friction is the smallest and they can be made into mechanical seals which are able to work in highest working requirements.

SiC physical property
Technical Parameter Unit SiC SSiC
Hardness HS 110 115
Porosity Rate % <0.3 <0.2
Density g/cm3 3.00~3.05 >3.10
Compressive Strength MPa >2200 >2500
Fractural Strength MPa >350 >380
Coefficient of Heat Expansion 10-6/oC 4 4.2
Content of Sic % ??90 ??98
Free Si % ??10 ??1
Elastic Modulus GPa ??400 ??410
Temperature oC 1300 1400