VAMAC DHC MAKES DURABLE SEALS, CURES UP TO 30 PER CENT FASTER

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VAMAC DHC MAKES DURABLE SEALS, CURES UP TO 30 PER CENT FASTER
01 July 2007 - DuPont Engineering Polymers

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.

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About: DuPont Engineering Polymers
The DuPont Engineering Polymers business manufactures and sells DuPont Crastin PBT and DuPont Rynite PET thermoplastic polyester resins, DuPont Delrin acetal resins, DuPont Hytrel thermoplastic polyester elastomers, DuPont ETPV engineering thermoplastic vulcanizates, DuPont Minlon mineral reinforced nylon resins, DuPont Thermx PCT polycyclohexylene dimethyl terephthalate, DuPont Tynex filaments, DuPont Vespel parts and shapes, DuPont Zenite LCP liquid crystal polymers and DuPont Zytel nylon resins.

These products serve global markets in the aerospace, appliance, automotive, consumer, electrical, electronic, industrial, sporting goods and many other diversified industries.

Founded in 1802 science company DuPont operates in more than 70 countries. It offers a wide range of products and services for markets including agriculture, nutrition, electronics, communications, safety and protection, home and construction, transportation and apparel.

DuPont Electronic & Communication Technologies is a leading supplier of electronic materials, fluoropolymers, fluorochemicals and imaging technologies.

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