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Material Friction Charts

Material and Material Combinations

Coefficient of Friction

Clean

Lubricated

Steel
Copper-lead alloy
Phosphor-bronze
Aluminum-bronze
Brass

0.8
0.22
0.35
0.45
0.35
0.16
...
...
...
0.19
Cast iron
Bronze
Sintered bronze
Hard carbon
Graphite
0.4
...
...
0.14
0.1
0.21
0.16
0.13
0.11-0.14
0.1
Tungsten carbide
Plexiglas
Polystyrene
Polythene
Teflon
0.4-0.6
0.4-0.5
0.3-0.35
0.2
0.04
0.1-0.2
0.4-0.5
0.3-0.35
0.2
0.04
Aluminum-aluminum
Cadmium-cadmium
Chromium-chromium
Copper-copper
Iron-iron
1.35
0.5
0.41
1.0
1.0
0.30
0.05
0.34
0.08
0.15-0.20
Magnesium-magnesium
Nickel-nickel
Platinum-platinum
Silver-silver
Zinc-zinc
0.6
0.7
1.2
1.4
0.6
0.08
0.28
0.25
0.55
0.04
Glass-glass
Glass-metal
Diamond-diamond
Diamond-metal
Sapphire-sapphire
0.9-1.0
0.5-0.7
0.1
0.1-0.15
0.2
0.1-0.6
0.2-0.3
0.05-0.1
0.1
0.2
Hard carbon on carbon
Graphite-graphite (in vacuum)
Graphite-graphite
Tungsten carbide-tungsten carbide
Plexiglas-plexiglas
0.16
0.5-0.8
0.1
0.2-0.25
0.8
0.12-0.14
...
0.1
0.12
0.8
Polystyrene-polystyrene
Teflon-Teflon
Nylon-nylon
Solids on rubber
Wood on wood (clean)
0.5
0.04
0.15-0.25
1-4
0.25-0.5
0.5
0.04
...
...
...
Wood on wood (wet)
Wood on metals (clean)
Wood on metals (wet)
Brick on wood
Leather on wood
0.2
0.2-0.6
0.2
0.6
0.3-0.4
...
...
...
...
...
Leather on metal (clean)
Leather on metal (wet)
Leather on metal (greasy)
Brake material on cast iron
Brake material on cast iron (wet)
0.6
0.4
0.2
0.4
0.2
...
...
...
...
...