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Technical Paper

Meeting Coolant Hose Compound Requirements of the Future

Ethylene-propylene rubber compounds have been utilized in automotive radiator and heater hoses for many years. This is due to the elastomer having superior resistance to ethylene glycol coolant fluids, outstanding ozone resistance, and excellent heat aging characteristics. However, recent automotive-design and engineering trends have created severe temperature environment under the hood. As a result, EPDM compounds are now evolving to more polymer-rich compositions with increased heat resistance, lower compression set, and non-bloom properties. Compounding principles are described to meet future heat aging requirements of coolant hose. Compositional and structural factors of the polymer are shown to have an important influence in maximizing the heat resistance.