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Vamac DHC makes durable seals, cures up to 30 per cent faster

Du Pont Engineering Polymers : 01 July, 2007  (New Product)
Vamac DHC, the newest addition to the DuPont Vamac ethylene acrylic elastomer family, cures up to 30 percent faster than existing no-postcure grades while improving compression set and oil resistance. Vamac DHC cures in the molding press, eliminating the cost and delay of traditional oven curing.
“Vamac DHC was developed for customers who need to minimize 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 (i.e., 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 150ºC. For parts used in hotter environments, Vamac DP, can operate continuously up to 165ºC.

Vamac DHC cures, in the press or at the die, with the aid of peroxides such as α‚α’-bis (tert-butylperoxy)-diisopropylbenzene or dicumyl peroxide. The material is well-suited for injection, transfer or compression molding 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.

DuPont is a science company. Founded in 1802, DuPont puts science to work by creating sustainable solutions essential to a better, safer, healthier life for people everywhere. Operating in more than 70 countries, DuPont offers a wide range of innovative products and services for markets including agriculture, nutrition, electronics, communications, safety and protection, home and construction, transportation and apparel.
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