Green Silicon Carbide

Crystal Form

Alpha SiC hexagonal system

Chemical nature

Slight acid

Reaction with acids

Very slight surface action with hydrofluoric acid

Reaction with Alkalies

Attcked at high temperature by alkalles and iron xide

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^oC

Max Usable temperature

1540^oC in air

Specific heat (cal/g.^oC )

0^oC

500^oC

1000^oC

0.14

0.28

0.13

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

600^oC

800^oC

1000^oC

0.080

0.061

0.051

Electrical resistivity (Wcm)

25^oC

100^oC

400^oC

800^oC

1400^oC

50

46.4

26.6

7.8

0.65

Coefficient of liner
expansion (x10^-6)

25^oC -500^oC

25^oC -1000^oC

25^oC -1500^oC

25^oC-2000^oC

25^oC-2500^oC

4.63

5.12

5.48

5.77

5.94

Grit

20# - 90#

100# - 180#

220# - 240#

280# - 400#

500# -600#

800# - 1200#

SiC Min

99.0

98.0

97.5

97.0

95.5

94.0

F.C Max

0.20

0.25

0.25

0.30

0.30

0.50

Fe₂O₃ Max

0.20

0.50

0.70

0.70

0.70

0.70

Grit

Magnetic material Content

16#-30#

<0.0180

36#-60#

<0.0150

70#-120#

<0.0120

150#-220#

<0.0100

Grit No.

Micron

Grit No.

Micron

Grit No.

Micron

10

2360 ~ 2000

30

710 ~ 600

80

212 ~ 180

12

2000 ~ 1700

36

600 ~ 500

90

180 ~ 150

14

1700 ~ 1400

40

500 ~ 425

100

150 ~ 125

16

1400 ~ 1180

46

425 ~ 355

120

125 ~ 106

20

1180 ~ 1000

54

355 ~ 300

150

106 ~ 75

22

1000 ~ 850

60

300 ~ 250

180

90 ~ 63

24

850 ~ 710

70

250 ~ 212

220

75 ~ 53

China GB 2477-83

JIS

FEPA(84) / DIN(70)

Grit No.

Norminal size range(µm)

Grit No.

ds50 value (µm)

Grit No.

ds50 value (µm)

Standard werte der Mikro-F-Reihe

Sedigraph 5000D

240

60.0±4.0

280

52.0±3.0

W63

63 - 50

320

46.0±2.5

F230/53

53±3.0

50.0±3.0

W50

50 - 40

360

40.0±2.0

F240/45

44.5±2.0

42.0±2.0

400

34.0±2.0

W40

40 - 28

500

28.0±2.0

F280/37

36.5±1.5

34.5±1.5

600

24.0±1.5

F320/29

29.2±1.5

27.7±1.5

W28

38 - 20

700

21.0±1.3

F360/23

22.8±1.5

21.6±1.5

800

18.0±1.0

F400/17

17.3±1.0

16.5±1.0

W20

20 - 14

1000

15.5±1.0

F500/13

12.8±1.0

12.3±1.0

W14

14 - 10

1200

13.0±1.0

1500

10.5±1.0

F600/9

9.3±1.0

9.0±1.0

W10

10 - 7

2000

8.5±0.7

W7

7 - 5

2500

7.0±0.7

F800/7

6.5±1.0

6.3±1.0

W5

5 - 3.5

3000

5.7±0.5

F1000/5

4.5±0.8

4.5±0.8

F1200/3

3.1±0.5

3.1±0.5

for general purposes

for general purposes

for bonded abrasives

Grinding wheels      

Electrical            

Coated tools          

Heating elements      

Polishing            

Ceramic                            

Lapping              

Refractory