Dynamic damping properties
TORAYPEF™ possesses semi-rigid compressive properties, so it does not bottom-out upon impact as a soft urethane foam does. Moreover, the superb elasticity of TORAYPEF™ prevents the brittle failure seen in polystyrene foam. These attributes provide TORAYPEF™ with its highly acclaimed damping properties. Figure 1 shows the change in damping properties after repeated impact. TORAYPEF™ exhibits virtually no change in damping properties after dozens of repeated impact events. This is a significant advantage over widely used conventional polystyrene foams. Figure 2 compares the dynamic damping properties curves (C-P curve) of TORAYPEF™ and other damping materials.
Solid line: TORAYPEF™ 30060 heat-laminated product, Thickness: 54 mm, W/A = 15 KPa
Dotted line: Polystyrene foam (ρ= 0.031), Thickness: 60 mm, W/A = 15 KPa
Figure 1: Change in damping properties of TORAYPEF™ after repeated impact
One minute between impact repetitions. Average value from five continuous impacts on a 30-times expanded foam product.
* These data are representative examples of measurement values obtained using specific conditions. The values should not be used as a standard.
Figure 2: TORAYPEF™ dynamic damping properties curve