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2007-07-19 News Release
New polymers dissipate
electrostatic charge
Siemens VDO selected electrostatically dissipative polymers from Ticona
for fuel system use to help prevent static charge build-up.
Siemens VDO has adopted Hostaform** EC140XF acetal copolymer (POM) from
Ticona, the engineering polymers business of Celanese Corporation, to
dissipate electrostatic charge in the fuel supply unit of the Ford Transit.
This POM is an extended-use, conductive grade developed for auto fuel
systems, especially those that handle aggressive fuel blends at elevated
temperature.
The Siemens application involves a POM holder for the contact system of
a fuel level indicator and the lever arm/float assembly mounted to it.
This system must operate over the life of the car in various fuels at
service temperatures from -40 to +80 °C, which reflects the increased
thermal requirements of diesel engines.
Plastic fuel system components can become electrostatically charged as
flowing fuel causes charge separation. The likelihood of charge build-up
occurring, and thus sparking, rises as fuel systems operate at higher
pressures and flow rates. Ticona’s new electrostatically dissipative
POM was developed to avert such charge accumulation and has been approved
for fuel system use by General Motors (GM Specification GMP.POM.045).
It also meets the SAE J1645* Recommended Practice for averting static
charge build-up in auto fuel systems.
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Siemens VDO Adopts New Electrically
Conductive Hostaform POM in Fuel Supply Unit for Ford
Transit. Click
Here for High resolution image. photo: Ticona |
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“Hostaform EC140XF extends our line of fuel-resistant acetal POMs,”
said Dwight Smith, application development engineer. “As an advanced,
conductive, carbon-black-filled acetal copolymer, it contains a proprietary
stabilization system that allows it to retain high toughness in the face
of long-term exposure to challenging fuels at elevated temperatures.
“We developed this grade based on the many customer requests we
received for a higher-temperature, conductive acetal for fuel systems.
In addition to fuel resistance, they wanted consistent conductive properties
from lot to lot and excellent processability. We succeeded on all accounts.
From a processing standpoint, Hostaform EC140XF runs well on molding machines
without any start-up delays."
In addition to the Siemens VDO application, Hostaform EC140XF POM is being
used in inlet check valves in passenger cars and trucks, and is under
consideration for such fuel system elements as filler necks, fuel filter
housings, fuel flanges, fuel pumps, vapor canisters, tank mounted valves
and sending units. These polymers can be used wherever electrostatic charge
can damage sensitive electrical components or trigger thermal events,
such as in all-terrain vehicles, motorcycles, personal watercraft, and
pumps for flammable materials and other industrial components.
Hostaform EC140XF is based on Hostaform C13031XF, which offers high chemical
and impact resistance for use with diesel and gasoline fuel systems, especially
those involving biodiesel fuel blends. The high acidity of these fuels
makes them more reactive with standard acetals polymers and other plastics,
especially at higher temperatures. Hostaform EC140XF has been modified
to emphasize use with elevated service temperatures over the long term.
* SAE J1645 is a recommended practice that seeks to prevent electrostatic
charge build-up in automotive fuel systems due to fuel flowing during
refueling and in the fuel delivery system. It applies to liquid fuels,
fuel system components and vehicle areas adjacent to fuel systems.
** Hostaform is a registered trademark of Ticona, the engineering polymers
business of Celanese Corporation, or its affiliates.
Read a recent press release about - DSM Engineering Plastics introduces
a range of High Flow and High Productivity
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resins.
Polymers
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