Hardeness

5.5-6.5 Mohs' Scal 570 KHN 100

Design Tensile Strength

4.8x107 Pa (N/mm2) (7000psi)

Design Compressive Strength

>1.1x109 Pa (160,000 psi)

Bulk Modulus

3.7x1010 Pa （5.3x106psi)

Rigidity Modulus

3.1x1010 pa (4.5x106psi)

Young's Modulus

7.2x10-10 pa (10.5x106 psi)

Poisson's Ratio

0.17

Coefficient of Thermal Expansion

5.5x10-7cm/cm. °C (20°C-30°C)

Thermal Conductivity

1.4 W/m. °C

Specific Heat

670J/kg. °C

Softerning Point

1683°C

Annealing Point

1215°C

Strain Point

1120°C

Electrical Receptivity

7x107 ohm.cm (350°C)

Velocity of Sound-Shear Wave

3.75x103 m/s

Velocity of Sound/ Compression Wave

5.9x103 m/s

Sonic Attenuation

<11db/m MHZ

Chemical Stability (except hydrofuoric)

High resistance to water and acids

Dielectric Properties (20°C and 1MHZ)
Constant
Strength
Loss Factor
Dissipation Factor

3.75
5x107 V/M
Less than 4x10-4
Less than 1x10-4