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News

New DuPont engineering polymers for environmentally friendly, safe fuel systems

Du Pont Engineering Polymers : 25 October, 2001  (New Product)
The Delrin 511 series of acetal resins are designed for use in systems handling any of the world's many types of petrol, with their widely differing acid and alcohol contents, which place different demands on contact materials. For parts such as filler necks, filler caps and quick connectors, where static electricity build-up means danger, DuPont has developed anti-static Delrin types, which discharge static and thus contribute to greater safety. Carbon-fibre-reinforced Delrin 300AS offers maximum stiffness together with strength and fuel resistance. The outstanding feature of Delrin 300AT is its impact strength
DuPont has developed a number of new engineering polymers and other materials for use in automotive fuel systems, to enable car makers and their system suppliers to meet a broad range of challenges. These include aggressive fuels, high pressures and temperatures, and regulatory constraints to reduce vehicle emissions.

The Delrin 511 series of acetal resins are designed for use in systems handling any of the world's many types of petrol, with their widely differing acid and alcohol contents, which place different demands on contact materials. For parts such as filler necks, filler caps and quick connectors, where static electricity build-up means danger, DuPont has developed anti-static Delrin types, which discharge static and thus contribute to greater safety. Carbon-fibre-reinforced Delrin 300AS offers maximum stiffness together with strength and fuel resistance. The outstanding feature of Delrin 300AT is its impact strength–more than twice as high as other anti-static acetal resins available until now.

Emissions from polyethylene fuel tanks, filler necks, filter housings, active-carbon containers and fuel lines can be almost entirely prevented with DuPont's barrier technologies, like one based on a new type of Selar RB. Emission reduction is a current requirement by the California Air Resources Board (CARB LEV II) which other parts of the world are expected to follow. And DuPont Teflon and Tefzel fluoropolymers help automotive fuel system manufacturers meet the latest government emission regulations by resisting even the most aggressive biodiesel and sour gas fuel compositions, and by providing near-zero permeation.

In modern Diesel motors with common rail technology, fuel in the return line reaches temperatures of over 90 °C, with peaks of up to 130 °C. Standard acetal resins, which were used hitherto for fuel gauges, rapid couplings or filters, would degrade rapidly under the mechanical, chemical and thermal stresses that build up in these conditions. With Delrin 300 HD, DuPont offers a material which is capable of giving reliable long-term service even in hot Diesel fuel.

Many fuel-resistant, non-permeating types from the big family of DuPont Zytel nylons are also suitable for petrol-contact applications such as filler caps, necks and tubes, fuel leads and connectors, as well as for distributor pipes. Special Zytel types are available for active-carbon-containers, wherever they are located: high-impact-strength types for wheel-arch installation, high-temperature types for the motor compartment, and other types which combine low permeability with high fuel resistance for future uses as material for the fuel tank itself.
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