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Angle of Repose

Tipping or dumping angles for common materials like ashes, sand, earth, shingles and more.

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Stockpile - tipping or dumping angle

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:

MaterialAngle
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

repose angle

Calculate stockpile volume!

Stockpile height vs. diameter and repose angle

Download and print Stockpile Height vs. Diameter and Angle of Repose Chart

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