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. Peroxide crosslinking, preferred for heat and oxidative stability over conventional sulfur, has fundamental problems associated with its use; systems are described to maximize the rate of cure and development of physical properties. Long term heat exposure has been studied from 150°C through 200°C to assess serviceability. Present and future recommended coolant hose compounds are compared under these conditions.
Meeting Coolant Hose Compound Requirements of the Future
Sae Technical Papers
SAE International Congress and Exposition ; 1987
01.02.1987
Aufsatz (Konferenz)
Englisch
Drag , Coolants , Hoses , Elastomers , Radiators , Heat resistant materials
Meeting Coolant Hose Compound Requiremts of the Future
Kraftfahrwesen | 1987
|Coolant Hose Resists Heat, Electrochemicals
British Library Online Contents | 1993
Coolant hose for heavy duty engines
Kraftfahrwesen | 1988
|Coolant Hose for Heavy Duty Engines
SAE Technical Papers | 1988
|Coolant hose for heavy duty engines
Tema Archiv | 1988
|