Major issues
• Heavy cargo loads create flexing of the poly and strain between the poly compound and the bond.
  - Just like kneading pizza dough – flexed material heats up. Heat inside the poly will keep accumulating from constant usage (kneading), until reaching the melt down temperature. The polyurethane mass will become liquid and destroyed.
  - Under high speeds the bond between poly and steel gets repeatedly stressed. If the bond strength is weak, it can be pulled away from the steel resulting in bond failure.

Solutions
• Use a higher dynamic compound that generates less heat and has a higher melt down temperature.
• Strengthen the bond and use relatively harder poly to limit material movement in the load wheel.
• Cushothane^® XL^™ 93A hardness for tires and 97A hardness for load wheels with XL^3™ bonding.