Crystal Form

Alpha SiC hexagonal system

Chemical nature

Slight acid

Reaction with acids

Very slight surface action with hydrofluoric acid

Reaction with Alkalis

Attacked at high temperature by alkalis and iron oxide

Oxidation-reduction effects  

Starts to oxide slowly at 800°C. No reduction

True Density (g/cm³)

3.20

Hardness  

Knoop (kg/cm²)

2500-2900

Moh’s

9.5

Color

Green

Color after firing

Green

Decomposition point

2300°C

Max Usable temperature

1540°C  in air

Specific heat (cal/g.^oC )

0°C

500°C

1000°C

0.14

0.28

0.13

Coefficient of thermal conductivity (cal/cm².sec.^oC)

600°C

800^oC

1000°C

0.080

0.061

0.051

Electrical resistivity(W^cm)

25°C

100°C

400°C

800°C

1400°C

50

46.4

26.6

7.8

0.65

Coefficient of liner expansion (x10^-6)

25°C -500°C

25°C -1000°C

25°C-1500°C

25°C-2000°C

25°C-2500°C

4.63

5.12

5.48

5.77

5.94