TPV 80, TPV 60 and ENB #3 TPV samples were subjected to friction tests with and without 5 g/m2 of Hwaseung Chemical’s coating according to the test conditions of the German Automobile Manufacturers Association (VDA 230-206, 2007), as shown in Figure 11, and acceleration (g) was measured.
As shown in Figure 12(a), when the damping of the TPV material (uncoated flocking) was increased, the absolute maximum value of acceleration during the vibration decreased by approximately 40% from 1.19 g to 0.71 g. In contrast, the reduction was approximately 94.1–94.4% for TPV 60 (from 1.19 g to 0.07 g) and ENB #3 (from 0.71 g to 0.04 g) if coating is applied (Figure 12(b)). It was clearly seen that the effect of the coating on the flocking surface was more significant on squeaking noise than the effect of material damping.