PA abrasives:
PA abrasives is bayer alumina,which is electrically fused in high temperature,being added with the right quantity of oxidized chromium. lt is pink.lts hardness is close to,but toughness higher than that or WA.
Chemical composition:
| Specification | Low chromium | Medium chromium | High chromium | ||||||
| Al2O3 (%) | Cr2O3 (%) | Na2O (%) | Al2O3 (%) | Cr2O3 (%) | Na2O (%) | Al2O3 (%) | Cr2O3 (%) | Na2O (%) | |
| F12-F80 | ≥98.50 | 0.20-0.45 | ≤0.50 | ≥98.20 | 0.45-1.00 | ≤0.55 | ≥97.40 | 1.00-2.00 | ≤0.55 |
| F90-F150 | ≥98.50 | ≤0.50 | ≥98.20 | ≤0.60 | ≥97.00 | ≤0.60 | |||
| F180-F220 | ≥98.50 | ≤0.50 | ≥98.80 | ≤0.70 | ≥96.50 | ≤0.70 | |||
Physical property:
| Basic minerals | Crystal size μm | True density g/cm3 | Bulk density g/ cm3 | Knoop hardness kg/mm2 |
| α-Al2O3 | 600-2000 | ≥3.90 | 1.40-1.91 | 2200-2300 |
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