What is WA JIS#1000?
WA means White Alumina,a kind of high-grade refractories, was made from the high quality alumina by melting above 2000 in the electric arc furnace and cooling. It is white with the main crystal phase alpha-Al2O3.The white alumina produced in titling electric arc furnace has the advantage of high bulk density and low porosity and the volume stability and thermal shock resistance can be improved.
JIS#1000 is the size of the material of white alumina,which define how big the grit scale,please take the following standard for reference.
| Size | D0（um） | D3(um) | D50(um) | D94(um) |
| #240 | 127max | 103max | 57.0±3.0 | 40min |
| #280 | 112max | 87max | 48.0±3.0 | 33min |
| #320 | 98max | 74max | 40.0±2.5 | 27min |
| #360 | 86max | 66max | 35.0±2.0 | 23min |
| #400 | 75max | 58max | 30.0±2.0 | 20min |
| #500 | 63max | 50max | 25.0±2.0 | 16min |
| #600 | 53max | 41max | 20.0±1.5 | 13min |
| #700 | 45max | 37max | 17.0±1.5 | 11min |
| #800 | 38max | 31max | 14.0±1.0 | 9.0min |
| #1000 | 32max | 27max | 11.5.±1.0 | 7.0min |
| #1200 | 27max | 23max | 9.5±0.8 | 5.5min |
| #1500 | 23max | 20max | 8.0±0.6 | 4.5min |
| #2000 | 19max | 17max | 6.7±0.6 | 4.0min |
| #2500 | 16max | 14max | 5.5±0.5 | 3.0min |
| #3000 | 13max | 11max | 4.0±0.5 | 2.0min |
| #4000 | 11max | 8.0max | 3.0±0.4 | 1.8min |
| #6000 | 8.0max | 5.0max | 2.0±0.4 | 0.8min |
| #8000 | 6.0max | 3.5max | 1.2±0.3 | 0.6min |
