Brown Fused Alumina

Product Code: Brown Fused Alumina

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Brown Fused Alumina

Chemical & Physical Properties

Crystal Form

Alpha Alumina Trigonal System

Chemical Nature

Amphoteric

Reaction with Acids

Subject to mild attack by aqua and/or hydrofluoric acid

Reaction with Alkalis

Very slight with strong hot solution only

Oxidation-reduction effects

None

True Density(g/cm3)

3.97

Hardness

Knoop(kg/cm2)

2000-2200

Moh’s

9.0

Color

Dark Brown

Color After Firing

Light Blue

Melting Point

2000 °C

Max. Usable Temperature

1900 °C

Specific Heat (cal/g °C)

0.26 (20-29 °C)

Coefficient of thermal conductivity

(cal/cm2.sec.°C)

Room Temperature

900 °C

 

0.047

0.013

Electrical resistivity (Wcm)

30 °C

300 °C

900 °C

1600 °C

1016

1013

105

104

Coefficient of liner expansion (x10-6)

7-9(0-1600°C)

 

Chemical Composition (% by weight)

Grit Item

10 – 90

100 – 180

220-220

230 – 400

500 -1200

Al2O3

94.5 – 97.0

9305 Min.

92.5 Min.

91.0 Min.

89.0 Min.

TiO2

1.5 – 3.8

1.5 – 3.8

1.5 -3.8

4.0 Max

4.0 Max

 

Magnetic Matters Contents (% by weight)

Grit No.

Magnetic Matters Content

16#-30

<0.0380

36#-60#

<0.0280

70-120#

<0.0230

150#-220#

<0.0170

 

Grit No.

Micron

Grit No.

Micron

Grit No.

Micron

10

2360 ~ 2000

30

710 ~ 600

60

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

22

850 ~ 710

70

250 ~ 212

220

75 ~ 53

 

Available micron powder sizes

China GB

2477-83

JIS

FEPA(84) / DIN(70)

SO(77)

Grit No.

Norminal

size range

(μm)

Grit No.

ds50 value

(μm)

Grit No.

ds50 value (μm)

 

Grit No.

ds50

value (μm

 

 

 

 

 

Standard

werte

der Mikro-

F-Reihe

Sedigraph

5000D

 

 

 

 

240

60.0±4.0

 

 

 

P240

58.5±2.0

 

 

280

52.0±3.0

 

 

 

P280

52.2±2.0

W63

63 - 50

320

46.0±2.5

F230/53

53±3.0

50.0±3.0

P320

46.2±1.5

W50

50 - 40

360

40.0±2.0

F240/45

44.5±2.0

42.0±2.0

P360

40.5±1.5

 

 

400

34.0±2.0

 

 

 

P400

35.0±1.5

W40

40 - 28

500

28.0±2.0

F280/37

36.5±1.5

34.5±1.5

P500

30.2±1.5

 

 

600

24.0±1.5

F320/29

29.2±1.5

27.7±1.5

P600

25.8±1.0

W28

38 - 20

700

21.0±1.3

F360/23

22.8±1.5

21.6±1.5

P700

21.8±1.0

 

 

Terms & Conditions

1.       Prices will be quoted as per Enquiry.

2.       Delivery immediate from factory after confirmation of Purchase Order and Payment.

3.       Packing 1 MT Jumbo Bag.

4.       Delivery on CIF or FOB Basis.

5.       Payment Terms is 100% TT or 100% LC at Sight.

6.       Others Can be discussed.

 

 

Brown Fused Alumina

Brown Fused Alumina (BFA) is produced by a reduction fusion of high quality bauxites in electric arc furnaces. It is both a hard and tough material with high strength, making it an excellent abrasive grain for applications such as grinding wheels, sandpaper, blasting media, metal preparation, lapping, polishing, and grinding. Its thermal properties make it an excellent raw material for refractory applications.

 

Chemical & Physical Properties

Crystal Form

Alpha Alumina Trigonal System

Chemical Nature

Amphoteric

Reaction with Acids

Subject to mild attack by aqua and/or hydrofluoric acid

Reaction with Alkalis

Very slight with strong hot solution only

Oxidation-reduction effects

None

True Density(g/cm3)

3.97

Hardness

Knoop(kg/cm2)

2000-2200

Moh’s

9.0

Color

Dark Brown

Color After Firing

Light Blue

Melting Point

2000 °C

Max. Usable Temperature

1900 °C

Specific Heat (cal/g °C)

0.26 (20-29 °C)

Coefficient of thermal conductivity

(cal/cm2.sec.°C)

Room Temperature

900 °C

 

0.047

0.013

Electrical resistivity (Wcm)

30 °C

300 °C

900 °C

1600 °C

1016

1013

105

104

Coefficient of liner expansion (x10-6)

7-9(0-1600°C)

 

Chemical Composition (% by weight)

Grit Item

10 – 90

100 – 180

220-220

230 – 400

500 -1200

Al2O3

94.5 – 97.0

9305 Min.

92.5 Min.

91.0 Min.

89.0 Min.

TiO2

1.5 – 3.8

1.5 – 3.8

1.5 -3.8

4.0 Max

4.0 Max

 

Magnetic Matters Contents (% by weight)

Grit No.

Magnetic Matters Content

16#-30

<0.0380

36#-60#

<0.0280

70-120#

<0.0230

150#-220#

<0.0170

 

Grit No.

Micron

Grit No.

Micron

Grit No.

Micron

10

2360 ~ 2000

30

710 ~ 600

60

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

22

850 ~ 710

70

250 ~ 212

220

75 ~ 53

 

Available micron powder sizes

China GB

2477-83

JIS

FEPA(84) / DIN(70)

SO(77)

Grit No.

Norminal

size range

(μm)

Grit No.

ds50 value

(μm)

Grit No.

ds50 value (μm)

 

Grit No.

ds50

value (μm

 

 

 

 

 

Standard

werte

der Mikro-

F-Reihe

Sedigraph

5000D

 

 

 

 

240

60.0±4.0

 

 

 

P240

58.5±2.0

 

 

280

52.0±3.0

 

 

 

P280

52.2±2.0

W63

63 - 50

320

46.0±2.5

F230/53

53±3.0

50.0±3.0

P320

46.2±1.5

W50

50 - 40

360

40.0±2.0

F240/45

44.5±2.0

42.0±2.0

P360

40.5±1.5

 

 

400

34.0±2.0

 

 

 

P400

35.0±1.5

W40

40 - 28

500

28.0±2.0

F280/37

36.5±1.5

34.5±1.5

P500

30.2±1.5

 

 

600

24.0±1.5

F320/29

29.2±1.5

27.7±1.5

P600

25.8±1.0

W28

38 - 20

700

21.0±1.3

F360/23

22.8±1.5

21.6±1.5

P700

21.8±1.0

 

 

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