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High Quality and Competitive Price
Exported to Japan and Europe etc

WhiteFused Alumina

White fused alumina is made from high qualityBayer-processed alumina by fusing in an electric arc furnace athigh temperature. It has high hardness and better cuttingcharacteristics. It is suitable for manufacturing of vitrified andresinoid tools, and for lapping, polishing and blasting. It can bealso used to make engineering ceramic and superior refractoryproducts

 

Chemical & PhysicalProperties Crystal Form Alpha alumina trigonal system Chemical nature Amphoteric Reaction with acids Attck less than brown fused alumina Reaction with Alkalies Very slight with strong hot solution only Oxidation-reduction effects None True Density (g/cm3) 3.96 Hardness Knoop (kg/cm2) 2000-2200 Moh''s 9.0 Color White Color after firing White Melting point 2000oC Max usable temperature 1900oC Specific heat (cal/g.oC ) 20oC 100oC 0.183 0.217 Coefficient of thermal conductivity (cal/cm2.secoC) Room temperature 900oC 0.047 0.013 Electrical resistivity (Wcm) 30oC 300oC 900o C 1600oC 1016 1013 105 104 Coefficient of liner expansion (x10-6) 25oC-500oC 25oC-1000oC 25oC-1500oC 7.58 8.52 9.29

ChemicalComposition Grit 12# - 90# 100# - 220# 230# - 400# 500# - 1200# Al2O3 98.5 min 98.5 min 98.0 min 97.0 min Na2O 0.5 max 0.7 max 0.8max 0.8max

MagneticMaterialContent (% byweight)  Grit Magnetic Material Content 16#-24# <0.0023 30#-120# <0.0021 150#-240# <0.0015

Available grainsizes 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

 

Availablemircron powder sizes
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