Automotive Fuel Hoses Made for Today’s Lighter Engines
Today’s smaller, lighter enginesare turning up the heatand
pressureon automotive fuel hoses.
DuPont hasa range of materials and specialized applications designed to meet the challenges and support next-generation performance and fuel efficiency.
Viton® For Maximum Fuel Resistance
Viton® fluoroelastomerscan provide resistance for all types of automotive fuels and fuel blends, whether gasoline, ethanol, diesel or biodiesel. And hydrocarbon permeation resistance of Viton® can help OEMs meet the everincreasing regulatory requirements such as CARB’s LEV III and Euro 5 .
By proper selection of the Viton® grade and compound formulation, fuel permeations andaging resistance can be maximized for the application and fuel type to meet today’s automotive requirements.
Viton® extrusion types such as VTR-9209 have been optimized for fuel hose applications with improved extrusion processing, excellent adhesion, and low permeation in fuels and biofuel blends.
Viton® APA grades, such as GBL-S provide resistance to degraded and aggressive biodiesel fuel in hightemperature applications, combined with superior extrudability.
Vamac® Outperforms in Aging Tests
Automotive fuel hoses typically have a premium inner layer like Viton® to provide permeation resistance, and a thicker cover layer to providea cost-effective hose that can meet high temperature requirements. Some fuel hoses have to withstand relatively high temperatures because they route through the engine compartments. A fuel hose made of a Viton® inner layer and a Vamac® cover can combine good fuel resistance and high temperature properties. The initial adhesion between the two layers is very good, and the adhesion is still very good after heat aging, providing overall durability.
Vamac®G, GXF or Ultra HT polymers have been used in the hose cover compounds. The optimum grade depends on the end-use requirements. The Vamac® Ultra HT compounds will have the best dynamic properties and the best heat aging, while the Vamac® G will provide the most cost effective compound.
DuPont Helps Automakers Meet Regulations
DuPont is helping automotive OEMs to meet Euro 5 and the next generation Euro 6 emission regulations for hoses, ducts, gaskets, and other underhood components. This requires helping customers find the right match of materials with the best processesto meet the specificperformance, cost, workability and timing needs of each customer.
Elastomeric fuel hose constructed of a thin veneer of Viton® and a cover layer of Vamac®meets the needs of many customers--providing the automotive performance requirements of mechanical strength, fuel aging, hydrocarbon permeation resistance and high-temperature performance at an optimum price.