Angles of Repose
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) |
|---|---|
| Alfalfa, ground | +45 |
| Alum, lumpy | 30 - 45 |
| Alum, pulverized | 30 - 45 |
| Alumina | 30 |
| Asbestos, shredded | 30 |
| Ashes, dry | 33 |
| Ashes, moist | 36 |
| Ashes, wet | 30 |
| Asphalt | 45 |
| Bagasse | 45 |
| Baking powder | 30 - 45 |
| Bark, wood refuse | 45 |
| Bauxite, crushed | 30 - 45 |
| Bentonite | 45 |
| Bicarbonate of Soda | 42 |
| Borax, fine | 30 - 45 |
| Bran | 30 - 45 |
| Brewers grain | 45 |
| Brick | 40 |
| Calcium Carbide | 30 - 45 |
| Chalk, fine | 45 |
| Chalk, lumpy | 45 |
| Chromic acid, flake | 25 |
| Chromium ore | 30 - 45 |
| Cinders, dry | 33 |
| Cinders, moist | 34 |
| Cinders, wet | 31 |
| Cinders and Clay | 30 |
| Clay | 45 |
| Clover seed | 28 |
| Coal, hard | 24 |
| Coal, soft | 30 |
| Coconut, shredded | 45 |
| Cofee, fresh beans | 35 - 45 |
| Coke | 23 |
| Concrete | 30 |
| Cork, ground | 45 |
| Corn, grits | 30 - 45 |
| Cottonseed, cake lumpy | 30 - 45 |
| Cryolite | 30 - 45 |
| Cullet | 30 - 45 |
| Dolomite, lumpy | 30 - 45 |
| Earth, loose | 28 |
| Earth, compact | 50 |
| Feldspar, pulverized | 45 |
| Fish, meal | 45 |
| Flour, wheat | 45 |
| Fluorspar, lumps | 45 |
| Garbage | 30 |
| Gluten, meal | 30 - 45 |
| Graphite, flake | 30 - 45 |
| Gravel | 40 |
| Gypsum, pulverized | 45 |
| Hops, moist | 45 |
| Ilemenite | 30 - 45 |
| Iron oxide pigment | 40 |
| Kaolin, green crushed | 35 |
| Lignite, dry | 30 - 45 |
| Lime, hydrated | 30 - 45 |
| Limestone, pulverized | 45 |
| Linseed, meal | 30 - 45 |
| Malt | 30 - 45 |
| Marble, broken | 30 - 45 |
| Mica, broken | 30 - 45 |
| Milk. powdered | 45 |
| Oats | 32 |
| Oats, rolled | 30 - 45 |
| Ore, dry | 30 |
| Ore, damp or fresh mined | 37 |
| Oyster shells, ground | 30 - 45 |
| Peanuts, shelled and not shelled | 30 - 45 |
| Potassium chloride | 30 - 45 |
| Rice grits | 30 - 45 |
| Rice, rough | 30 - 45 |
| Rubber, ground scrap | 45 |
| Rubble | 45 |
| Salt, coarse | 30 - 45 |
| Salt, fine | 30 - 45 |
| Saltpeter | 30 - 45 |
| Sand, dry | 35 |
| Sand, damp | 40 |
| Sand, with crushed stone | 27 |
| Shale, broken | 30 - 45 |
| Shingles | 40 |
| Slate, pulverized | 30 - 45 |
| Soap, chips | 30 - 45 |
| Soap. powder | 30 - 45 |
| Soda ash | 30 - 45 |
| Stone | 30 |
| Stone, broken | 27 |
| Stone, crushed | 30 |
| Sugar, granulated | 30 - 45 |
| Sugar, raw cane | 45 |
| Sulfur | 30 - 45 |
| Tobacco | 45 |
| Wheat | 28 |
| Zinc oxide | 45 |
- 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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