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Brown Aluminum Oxide

Brown Aluminum Oxide, Brown Fused Alumina, is suitable for manufacturing of vitrified and resin bonded abrasive tools, and for lapping, polishing and sand blasting, surface preparation sand cleaning.
It can be also used to make superior refractory products.

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Product Description

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 Alkalies		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	93.5 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

Available grain sizes
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

Available mircron powder sizes
China GB 2477-83		JIS		FEPA(84) / DIN(70)			ISO(77)
Grit No.	Norminal size range(µm)	Grit No.	ds50 value (µm)	Grit No.	ds50 value (µm)		Grit No.	ds50 value (µm)
Grit No.	Norminal size range(µm)	Grit No.	ds50 value (µm)	Grit No.	Standard werte der Mikro-F-Reihe	Sedigraph 5000D	Grit No.	ds50 value (µm)
		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	P800	21.8±1.0
		800	18.0±1.0	F400/17	17.3±1.0	16.5±1.0	P1000	18.3±1.0
W20	20 - 14	1000	15.5±1.0	F500/13	12.8±1.0	12.3±1.0	P1200	15.3±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			for coated abrasives

Brown Fused Alumina Refractories (% by weight)
Group Sizes of BFA		Mixed Sizes of BFA
Sizes (mm)	Chemical Content	Sizes (mm)	Chemical Content
8-5 5-3 3-1 1-0	Al₂O₃>94.50 SiO₂<1.2 Fe₂O₃<0.2 TiO₂<3.8 CaO<0.5 MgO<0.4	25-0 10-0 5-0 3-0	Al₂O₃>94.50 SiO₂<1.2 Fe₂O₃<0.2 TiO₂<3.8

Application
Vitrified tools	Lapping
Resinoid tools	Blasting
Polishing	Scrubing
Tumbling	Deburring
Self-tumbling	Non-slip
Lapping compound	Wire saw

Brown Fused Aluminum Oxide For Sandblasting manufacturers

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