Material

Avg. Wt. Lbs. Per
Cubic Foot

Angle of Repose
(Loose)

Recommended Max.
Angle of Conveying

Alum, Lumpy

50-60

30°- 44°

18°

Alum, Pulverized

45-60

30°- 44°

20°

Ashes, Dry

35-45

45°

22°

Ashes, Wet

45-50

45°

25°

Barley

36-48

25°

16°

Bauxite, Crushed, Dry

75-85

35°

20°

Bentonite, Pulverized

50-60

42°

20°

Boax, Powered

45-55

30°- 44°

22°

Cement,Bulk, In Binns

100

Cement, Bulk, Conveying

65

20°

Cement, Clinker

75-95

35°

18°

Charcoal

18-28

35°

20°

Cinder, Coal

40-45

35°

22°

Coal, Anthracite

52-60

35°

16°

Coal, Bituminous

50

38°- 45°

22°

Coke, Breeze

25-34

22°

Coke, Loose

23-32

30°- 44°

20°

Coke, Refiners

35-42

20°

Concrete, Wet

6” Slump

110-150

12°

2” Slump

110-150

30°

Copper Ore

120-150

30°- 44°

20°

Coral, Crushed

40-45

20°

Corn, Shelled

45

21°

16°

Cullet

80-120

30°- 44°

20°

Dolomite, Crushed

80-100

35°

22°

Earth, Common Loam, Dry

76

20°

Earth, Common Loam, Wet

102-112

45°

20°

Feldspar, Ground

65-70

35°- 40°

18°

Flue Dust, Blast Furnace

110-125

18°

Fluospar

110

45°

20°

Fullers Earth, Burnt

40

20°

Fullers Earth, Raw

35-40

23°

20°

Glass, Broken or Cullet

80-120

10°

20°

Granite, Crushed

95-100

20°

Gravel, Bank Run

90-100

38°

20°

Gravel, Crusher Run

100

20°

Gravel, Sharp

90-100

30°- 44°

20°

Gravel, Rounded

90-100

30°

15°

Gypsum, Calcined

55-60

20°

Gypsum, Crushed

90-100

20°

Gypsum, Powered

60-80

23°

Iron Ore

100-200

35°

22°

Kaolin Clay

63

35°

20°

Lead Ore, Galena

465

30°- 35°

22°

Lignite, Air Dried

45-55

35°

20°

Lime, Ground

60

43°

20°

Lime, Pebble

53-56

30°

18°

Lime, Quick, Lumps

53

18°

Limestone, Agicultural

70

30°- 44°

20°

Limestone, Crushed

85-90

38°

20°

Limestone, Pulverized

75-85

45°

20°

Limestone, Screenings

85-90

20°

Magnesite, Screened

120

20°

Magnesium Sulfate

70

30°- 44°

18°

Magnesium Oxide

120

30°- 44°

20°

Magnesium Ore

125-140

39°

22°

Marble, Crushed

80-95

35°

20°

Mica, Flake

17-22

19°

20°

Mica, Powder

13-15

35°

20°

Milk, Dried, Flake

36

30°- 44°

20°

Phosphate Rock

75-85

25°- 29°

20°

Phosphate Sand

90-100

18°

Pumice, Ground

42-45

45°

18°

Salt, Coarse

40-45

35°

20°

Salt, Fine

70-80

25°

22°

Sand, Bank, Damp

110-120

45°

22°

Sand, Bank, Dry

90-110

35°

15°

Sand, Foundry, Prepared

65-75

30°- 44°

24°

Sand, Foundry, Shakeout

90-100

39°

20°

Sand, Silica, Dry

90-100

20°- 29°

15°

Sand, Saturated

110-130

45°

15°

Sandstone, Quarried

82

35°

15°

Shale, Crushed

85-90

39°

20°

Sinter

110-135

18°

Slag, Furnace, Crushed

80-90

25°

18°

Slag, Furnace, Granulated, Dry

60-65

25°

22°

Slate, Crushed

80-90

28°

20°

Slate, Ground

80

45°

20°

Soapstone

40-50

20°

Soda Ash, Light

20-35

37°

20°

Soda Ash, Heavy

55-65

32°

20°

Sodium Nitrate

70-80

24°

20°

Stone, Crushed

85-90

20°

Stone, Screenings

85-90

18°

Stone, Dust

75-85

20°

Sugar Beet Pulp, Dry

12-15

20°- 29°

20°

Sugar Beet Pulp, Wet

24-54

20°- 29°

22°

Sugar Cane, Knifed

15-18

45°

15°

Sugar Cane, Unknifed

22-25

15°

Sugar, Raw

55-65

20°

Sugar, Refined

50-55

30°- 44°

15°

Sulphur, Crushed

50-60

20°

Sulphur, Lumpy

80-85

35°

20°

Sulphur, Powered

50-60

35°

22°

Talc

50-60

20°

20°

Trap Rock, Crushed

105-110

30°- 44°

20°

Vermiculite Ore

80

20°

Wheat

45-48

28°

16°

Wood Chips

15-32

45°

25°

Zinc Ore, Crushed

160

38°

20°

Zinc Oxide, Light

10-15

45°

20°

Zinc Oxide, Heavy

30-35

45°

20°