Elastomer cures in the press for speedy seals
A
DuPont (UK) product story
Edited by the Engineeringtalk editorial team
Dec 10, 2004
The newest addition to the DuPont Vamac ethylene acrylic elastomer family, Vamac DHC cures up to 30% faster than existing no-postcure grades while improving compression set and oil resistance.
The newest addition to the DuPont Vamac ethylene acrylic elastomer family, Vamac DHC cures up to 30% faster than existing no-postcure grades while improving compression set and oil resistance.
Vamac DHC cures in the moulding press, eliminating the cost and delay of traditional oven curing.
"Vamac DHC was developed for customers who need to minimise cure times while keeping a good balance of oil resistance and heat ageing for seals and gasket applications", said Doug King, Market Leader - Vamac for North America at DuPont Ethylene Copolymers.
Vamac DHC also exhibits excellent long-term retention of sealing force (ie low compressive-stress relaxation) and low-temperature flexibility.
"Adding a no-postcure offering to the broad Vamac portfolio provides a more comprehensive family of materials to meet a variety of requirements for different levels of compression set, temperature resistance and other key properties".
Vamac DHC can meet demanding requirements in a wide range of seals, gaskets, hoses, tubes and other parts for automotive and other industrial uses.
Potential automotive seal and gasket applications include powertrain, rocker cover and bonded piston seals.
Potential hose and tube uses include components for oil coolant, power steering, coolant, crankcase ventilation and coverings for fuel hoses.
O-rings, grommets and spark plug boots are additional application examples.
Vamac DHC is rated for continuous service up to 150C.
For parts used in hotter environments, Vamac DP, can operate continuously up to 165C.
Vamac DHC cures, in the press or at the die, with the aid of peroxides.
The material is well-suited for injection, transfer or compression moulding and for profile, tube or sheet extrusion.
Both Vamac DHC and DP are AEM dipolymers.
Traditional Vamac grades, such as Vamac G, are AEM terpolymers.
These products deliver even higher performance than the dipolymers but require postcure.
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