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New DuPont™ Zytel® HTN Grades Combat Corrosion of Electrical Wire, Contacts

New “Electrical/Electronics Friendly (EF)” grades of DuPont™ Zytel® HTN PPA resins offer sharply lower potential for corrosion of delicate metal parts that are in intimate contact with parts molded from them.

The new resins are formulated to avoid ingredients that can cause corrosion of fine copper magnet wire or sensitive electrical contacts in parts serving in hot, humid and/or wet environments encountered in automotive and industrial applications.

Photo: DuPont
DuPont™ Zytel® HTN “EF” products are available for the three series of glass-reinforced resins: HTN51G, HTN52G and HTN54G offering a potential solution in hot, moist environments where reduced corrosion and improved retention of electrical properties is required.

Compared to the standard Zytel® HTN grades, the EF resins provide an enhanced retention of volume resistivity with moisture exposure. Tested in DuPont Technical Centers, the EF grades passed CTI test with the most severe condition.

Potential automotive applications include encapsulated sensors for monitoring wheel speed, air or hydraulic pressure and transmission functions, and high-voltage cable connectors for electric and hybrid vehicles. Other potential uses include electrical components where retention of electrical properties with moisture exposure is needed.

Like other Zytel® HTN resins, the new EF grades are based on aromatic copolymers and exhibit excellent retention of strength and stiffness at elevated temperatures. They also feature a relatively low coefficient of thermal expansion, which contributes to their over-all performance in encapsulated parts such as sensors.

Three new “EF” grades are available. Zytel® HTN51G35EF offers the highest retention of properties with long-term exposure to moisture, chemicals and elevated temperatures, compared with other PPAs. Zytel® HTN52G35EF provides enhanced flow, for parts with thin wall sections, such as connectors. Zytel® HTN54G35EF offers enhanced impact resistance and excels in thermal cycling performance, an advantage for encapsulation applications. Both HTN52G35EF and HTN54G35EF also offer processors the benefit of using water for mold temperature control. All three resins contain 35 percent glass fiber reinforcement.

The new Zytel® HTN grades are joining an extensive portfolio of DuPont engineering polymers for encapsulation of electrical and electronic components. Other encapsulation offerings include DuPont™ Rynite® PET and DuPont™ Thermx® PCT thermoplastic polyesters, DuPont™ Zenite® LCP liquid crystal polymer, DuPont™ Zytel® PA66 and DuPont™ Zytel® PA612 resins. For more information, please visit

DuPont is a science-based products and services 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 and food; building and construction; communications; and transportation.

The DuPont Oval Logo, DuPont™, The miracles of science™ and all product names denoted with ® are trademarks or registered trademarks of E.I. Du Pont de Nemours and Company or its affiliates.

DuPont press contact
Horst Ulrich Reimer
Tel.: +49 (0)6172 871297
Fax: +49 (0)6172 871266

Horst Ulrich Reimer | DuPont
Further information:

Further reports about: Corrosion DuPont HTN HTN52G35EF PPA Rynite® PET Wire Zytel® hybrid vehicle

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