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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