The particle size distribution of chrome ore sand AFS 45-55 generally conforms to the American Foundry Society (AFS) particle size standards,
with the following specific ranges:
Key Parameters
AFS fineness value: 45-55 (indicates the average fineness of the particles; higher values indicate finer particles).
Typical particle size distribution (based on AFS standards):
Major particle size range: approximately 106–212 μm (corresponding to sieve mesh sizes 70–140).
Sieve size distribution example (may vary slightly by manufacturer):
70 mesh (212 μm): Residue ≤10%
100 mesh (150 μm): Main distribution range (30–50%)
140 mesh (106 μm): Pass rate ≥80%
Pan: Fines ≤5%
| Sieve | Micron | Mass-gram | Factor | Value |
| A | B | AXB | ||
| 6 | 3350 | 0 | 3 | 0 |
| 12 | 1400 | 0 | 5 | 0 |
| 20 | 850 | 0.02 | 10 | 0.2 |
| 30 | 600 | 2.3 | 20 | 46 |
| 40 | 425 | 6.84 | 30 | 205.2 |
| 50 | 300 | 35.52 | 40 | 1420.8 |
| 70 | 212 | 37.29 | 50 | 1864.5 |
| 100 | 150 | 14.56 | 70 | 1019.2 |
| 140 | 106 | 2.86 | 100 | 286 |
| 200 | 75 | 0.51 | 140 | 71.4 |
| 270 | 53 | 0.08 | 200 | 16 |
| -270 | -53 | 0.02 | 300 | 6 |
| 100 | 4935.3 | |||
| AFS49.35 | ||||
Notes
Application Example: Chromium ore sand with an AFS of 45-55 is often used in expanded castings or molding sand, where both transparency and surface finish are important.
Standard Testing: It is recommended to verify the actual distribution using sieve analysis .
For accurate data, refer to the specific supplier’s test report or conduct a laboratory sieve test.