White electrocorundum 25A 24A 23A Specifications
White electro-corundum, also known as white melted aluminum oxide. The grades of white electro corundum 25A 24A 23A are abrasive types in the Russian market according to the aluminum oxide purity and grits. White electro corundum 25A 24A 23A is a high-temperature resistant abrasive in the form of grain and powder. It is mainly composed of aluminum oxide (Al2O3), but in fact, it is artificial corundum, and the performance of artificial abrasives is not inferior to that of natural abrasives. May contain small amounts of other impurities. It is produced by arc melting of industrial aluminum oxide loose powder.
White electrofused corundum 25A 24A 23A featured high refractoriness, high wear resistance, and high grinding power.
According to the Russian national standards GOST 3647-80 and GOST 28818-90, White electric corundum(Электрокорунд белый ) specifications( particle sizes) of grain and micro powder are shown in the table below:
| White electro-corundum 25A 24A 23A Grain | Passing Mesh Size(um) | Retained Mesh Size(um) | |||
| GOST Size | FEPA Size | GOST Standard | FEPA Standard | GOST Standard | FEPAStandard |
| − | F008 | − | 2800 | − | 2360 |
| 200 | F010 | 2500 | 2360 | 2000 | 2000 |
| 160 | F012 | 2000 | 2000 | 1600 | 1700 |
| − | F014 | − | 1700 | − | 1400 |
| 125 | F016 | 1600 | 1400 | 1250 | 1180 |
| 100 | F020 | 1250 | 1180 | 1000 | 1000 |
| − | F022 | − | 1000 | − | 850 |
| 80 | F024 | 1000 | 850 | 800 | 710 |
| 63 | F030 | 800 | 710 | 630 | 600 |
| 50 | F036 | 630 | 600 | 500 | 500 |
| − | F040 | − | 500 | − | 425 |
| 40 | F046 | 500 | 425 | 400 | 355 |
| 32 | F054 | 400 | 355 | 320 | 300 |
| 25 | F060 | 320 | 300 | 250 | 250 |
| 20 | F070 | 250 | 250 | 200 | 212 |
| 16 | F080 | 200 | 212 | 160 | 180 |
| − | F090 | − | 180 | − | 150 |
| 12 | F100 | 160 | 150 | 120 | 125 |
| 10 | F120 | 120 | 125 | 100 | 106 |
| 8 | F150 | 100 | 106 | 80 | 75 |
| 6 | F180 | 80 | 90 | 63 | 75 |
| 5 | F220 | 63 | 75 | 50 | 63 |
| White electro corundum 25A 24A 23A powder | The coarsest particle | Coarse particle | Main particle | Mixed Particle | Fine Particle | ||||||
| GOST Size | FEPA Size | Mesh Size(um) | Max percentage | Mesh Size(um) | Max percentage | Mesh Size(um) | Min percentage | Mesh Size(um) | Min percentage | Mesh Size(um) | Max percentage |
| M63 | F230 | 100-63 | 0.50% | 100-63 | 12% | 63-50 | 60% | 63-40 | 85% | 0-40 | 3 |
| M50 | F240 | 80-63 | 0.50% | 80-50 | 12% | 50-40 | 60% | 50-28 | 85% | 0-28 | 3 |
| M40 | F320 | 63-50 | 0.50% | 63-40 | 12% | 40-28 | 60% | 40-20 | 85% | 0-20 | 3 |
| M28 | F360 | 50-40 | 0.50% | 50-28 | 12% | 28-20 | 60% | 28-14 | 85% | 0-14 | 3 |
| M20 | F400 | 40-28 | 0.50% | 40-20 | 15% | 20-14 | 60% | 20-10 | 80% | 0-10 | 5 |
| M14 | F500 | 28-20 | 0.50% | 28-14 | 15% | 14-10 | 60% | 14-7 | 80% | 0-7 | 5 |
| M10 | F600 | 20-14 | 0.50% | 20-10 | 20% | 10-7 | 55% | 10-5 | 75% | 0-5 | 5 |
| M7 | F800 | 14-10 | 0.50% | 14-7 | 20% | 7-5 | 55% | 7-3 | 75% | 0-3 | 5 |
| M5 | F1000 | 10-7 | 0.50% | 10-5 | 20% | 5-3 | 55% | 5-0 | 80% | − | − |
