What is morundum A-40?
Morudum A-40 here it means brown fused alumina abrasive,but it has its special characteritics,which is different from normal brown fused alumina.
Now list the characteristics as follows:
Chemical composition %
| Al2O3 | ≥96.5% |
| Fe2O3 | ≤0.10% |
| SiO2 | ≤0.5% |
| TiO2 | 2.3% |
Physical Properties
| Specific Gravity | Specific Gravity |
| Mohs Hardness | 9.0 |
| Bulk Density | 1.53-1.99g/cm3 |
| Melting Point | 2250℃ |
| Refractoriness | 1900℃ |
Size range of brown fused alumina BFA grit
| Grit | Size range（um) | Grit | Size range（um) |
| #12 | 2000-1700 | #54 | 355-300 |
| #14 | 1700-1400 | #60 | 300-250 |
| #16 | 1400-1180 | #70 | 250-212 |
| #20 | 1180-1000 | #80 | 212-180 |
| #22 | 1000-850 | #90 | 180-150 |
| #24 | 850-710 | #100 | 150-125 |
| #30 | 710-600 | #120 | 125-106 |
| #36 | 600-500 | #150 | 106-75 |
| #40 | 500-425 | #180 | 90-63 |
| #46 | 425-355 | #220 | 75-53 |