Density:         2.50-2.65 g/cm3

Elastic modulus:   510 Gpa

Knoop Hardness:  3300

Flexural strength:  400-650 Mpa

Compressive strength: 4100 Mpa

Fracture toughness:   4.5-7.0 Mpa.m1/2

Coefficient of thermal expansion: 4.5x106

Thermal Conductivityï¼?? 29 m0k

Maximum permissible service temperature in air: 1500C

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