Source: http://en.wikipedia.org/wiki/Friction#Approximate_coefficients_of_friction
Materials | Static friction | |
Dry and clean | Lubricated | |
Aluminium - Steel | 0.61 | |
Copper - Steel | 0.53 | |
Brass - Steel | 0.51 | |
Cast iron - Copper | 1.05 | |
Cast iron - Zinc | 0.85 | |
Concrete - Rubber | 1.0 | 0.3 |
Concrete - Wood | 0.62 | |
Copper - Glass | 0.68-7 | |
Glass - Glass | 0.94 | |
Metal - Wood(MIN) | 0.2 | 0.2 |
Metal - Wood(MAX) | 0.6 | |
Polyethene - Steel | 0.2 | 0.2 |
Steel - Steel | 0.8 | 0.16 |
Steel - PTFE (Teflon) | 0.04 | 0.04 |
PTFE (Teflon) - PTFE (Teflon) | 0.04 | 0.04 |
Wood - Wood(MIN) | 0.25 | 0.2 |
Wood - Wood(MAX) | 0.5 |