White fused alumina(WFA), a kind of high-grade refractories, is made from the imported quality alumina by melting above 2000 c in the electric arc furnace and cooling. It is white with the main crystal phase a-AL2O3. The white alumina produced in the titling electric arc furnace has the advantage of high bulk density and low porosity, thus the volume stability and thermal shock resistance can be improved.
WA for Abrasives Composition of the Grain Size Standard
(ISO8486:1996\FEPA42\GB1984\JIS R6001-1998\ANSI B74.12-1992\GB/T2481.1-1998):
Grain size | Best Coarse | Coarse | Normal part | Mixed part | Fine part | |||
100%pass these mesh NO. | Not pass mesh NO | Weight%short | Not pass | Weight%More than | Not pass mesh NO | Weight%More than | More than 3% pass these mash NO. | |
F4 | 5/16 | 31/2 | 20 | 4 | 40 | 4 5 | 70 | 6 |
F5 | 0.265 | 4 | 20 | 5 | 40 | 5 6 | 70 | 7 |
F6 | 31/2 | 5 | 20 | 6 | 40 | 6 7 | 70 | 8 |
F7 | 4 | 6 | 20 | 7 | 40 | 7 8 | 70 | 10 |
F8 | 5 | 7 | 20 | 8 | 45 | 8 10 | 70 | 12 |
F10 | 6 | 8 | 20 | 10 | 45 | 10 12 | 70 | 14 |
F12 | 7 | 10 | 20 | 12 | 45 | 12 14 | 70 | 16 |
F14 | 8 | 12 | 20 | 14 | 45 | 14 16 | 70 | 18 |
F16 | 10 | 14 | 20 | 16 | 45 | 16 18 | 70 | 20 |
F20 | 12 | 16 | 20 | 18 | 45 | 18 20 | 70 | 25 |
F22 | 14 | 18 | 20 | 20 | 45 | 20 25 | 70 | 30 |
F24 | 16 | 20 | 25 | 25 | 45 | 25 30 | 65 | 35 |
F30 | 18 | 25 | 25 | 30 | 45 | 30 35 | 65 | 40 |
F36 | 20 | 30 | 25 | 35 | 45 | 35 40 | 65 | 45 |
F40 | 25 | 35 | 30 | 40 | 40 | 40 45 | 65 | 50 |
F46 | 30 | 40 | 30 | 45 | 40 | 45 50 | 65 | 60 |
F54 | 35 | 45 | 30 | 50 | 40 | 50 60 | 65 | 70 |
F60 | 40 | 50 | 30 | 60 | 40 | 60 70 | 65 | 80 |
F70 | 45 | 60 | 25 | 70 | 40 | 70 80 | 65 | 100 |
F80 | 50 | 70 | 25 | 80 | 40 | 80 100 | 65 | 120 |
F90 | 60 | 80 | 20 | 100 | 40 | 100 120 | 65 | 140 |
F100 | 70 | 100 | 20 | 120 | 40 | 120 140 | 65 | 200 |
F120 | 80 | 120 | 20 | 140 | 40 | 140 170 | 65 | 230 |
F150 | 100 | 140 | 15 | 200 | 40 | 200 230 | 65 | 325 |
F180 | 120 | 170 | 15 | 200 230 | 40 | 200 230 270 | 65 | |
F220 | 140 | 200 | 15 | 230 270 | 40 | 230 270 325 | 65 | |
F240 | 170 | 200 | 5 | 230 270 | 8 | 230 270 325 | 38 |
(1)The mark for same grain size is mentioned defferently,such as:ANSIB and are:#60;ISO.FEPA.GB are :F60
(2)JIS R6001and ANSI B74.12 have no the mark of F22 and F40
(3)Only ANSI B74.12 have 240#,others have no 240#