|
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
|
...
...
...
...
...
|
