Angle of Repose
Tipping or dumping angles for common materials like ashes, sand, earth, shingles and more.
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The angle of repose, or critical angle of repose, of a granular material is the steepest angle of descent or dip relative to the horizontal plane to which a material can be piled without slumping. At this angle, the material on the slope face is on the verge of sliding. Angle of repose - angle where materials will slide out of the tipped body - for some typical products:
| Material | Angle of Repose (degrees) |
|---|---|
| Ashes, dry | 33 |
| Ashes, moist | 36 |
| Ashes, wet | 30 |
| Asphalt | 45 |
| Brick | 40 |
| Cinders, dry | 33 |
| Cinders, moist | 34 |
| Cinders, wet | 31 |
| Cinders and Clay | 30 |
| Clay | 45 |
| Coal, hard | 24 |
| Coal, soft | 30 |
| Coke | 23 |
| Concrete | 30 |
| Earth, loose | 28 |
| Earth, compact | 50 |
| Garbage | 30 |
| Gravel | 40 |
| Ore, dry | 30 |
| Ore, damp or fresh mined | 37 |
| Rubble | 45 |
| Sand, dry | 35 |
| Sand, damp | 40 |
| Sand, with crushed stone | 27 |
| Shingles | 40 |
| Stone | 30 |
| Stone, broken | 27 |
| Stone, crushed | 30 |
- repose angle - the angle between the horizontal plane and the side of the pile
Download and print Stockpile Height vs. Diameter and Angle of Repose Chart
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