Mechanical properties
Metals and alloys

Friction coefficients
Reference tables
Metal-metal contacts
Friction in screw joints
Rolling resistance
Air resistance

Wear coefficients
Metal-metal contacts

Physical properties
Metals and alloys
Solids / liquids / gasses
Metals (www.matweb.com)
Aluminum
High performance polymers
Coatings and surface treatments

Thermodynamics

Physical / mechanical properties >>
(listing of wiki links)