Comprehensive friction studies on polymer have been carried out in the past. Two most commonly applied testing methods are pin-on-disk test and scratch resistant test. The pin-on-disk apparatus has been used to study the wear of polymer [12] and [13]. The scratch test was mainly designed and conducted to investigate scratch damage mechanisms of polymers and soft coatings on hard substrates [14], [15] and [16]. It can be observed that when used to test polymer coatings, neither these tests simulate the large plastic deformation of sheet metal substrates.