TECH Centech Radial OTR repairs are reinforced with Aramid cord for maximum strength and flexibility to the repair unit to help reduce sidewall bulges. Advanced rubber compounds provide longer performance life in the most extreme OTR tire service conditions. Centech Radial OTR repairs are very flexible, resulting in easy installation, minimizing the chances of trapped air as well as restoring the strength of the tire with little resistance to the tire’s flex characteristics. Thermacure cushion gum permanently vulcanizes to the tire in hot or cold applications.