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

800oC

1000°C

0.080

0.061

0.051

Electrical resistivity(Wcm)

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

Grit sizes

SiC

F.C

Fe2O3

20# - 90#

99.0 min

0.20 max

0.20 max

100# - 180#

98.5 min

0.25 max

0.50 max

220# - 240#

97.5 min

0.25 max

0.70 max

280# - 400#

97.0 min

0.30 max

0.70 max

500# - 600#

95.5 min

0.30 max

0.70 max

800# - 1200#

94.0 min

0.30 max

0.70 max

Grit

Magnetic material Content

16#-30#

<0.018

36#-60#

<0.015

70#-120#

<0.012

150#-220#

<0.010

Grinding wheels       

Heating elements

Coated tools           

Refractory

Polishing             

Electrical

Lapping              

Ceramic