New DuPont HTN grade used in USB Type-C 3.1 connectors

DuPont;s Zytel HTN high-performance polyamide resin has been selected for use in reversible-plug USB Type-C connectors, which are forecast to replace Type-A and Type-B connectors and rule as the universal port for all devices, including desktops, laptops and mobile phones.

Requirements for use in USB Type-C and Type-C 3.1 connectors proved to be challenging for existing engineering plastics. “Devices are smaller, thinner and transmit data at extremely high rates and those needs proved to be too demanding for current polymer materials,” said Chun-Ku Chen, Asia-Pacific marketing manager of Diversified Industry at DuPont Performance Polymers, adding that wall thickness in Type-C connectors can be as little as 0.18 mm – less than two stacked sheets of paper. “We saw our customers struggling with existing materials and developed a new grade of the ZytelHTN FR52 Non Halogen product family with excellent flow rates, superior dimensional stability and low dielectric constant specifically for moulding Type-C connectors.”

Zytel HTN FR52 non-halogen grade also offers processing advantages compared with other PPA resins. It can handle the processing requirements of overmoulding metal that is needed to manufacture these connectors and exhibits lower moisture absorption than other high performance polyamides.

With the very high flow performance, it also allows customers to inject the materials at lower temperatures, which creates less mould deposit. This combination of features helps improve the productivity by reducing cycle time, increasing uptime and minimising maintenance costs. Another benefit is that it can be coloured to meet OEM and customer requirements. “We applied our compounding expertise to ensure that even colored USB Type-C cables connectors possess the right property balance for the application,” said Chen.

The new grade is already being commercially employed by several ODMs (original design manufacturers) serving global OEMs.


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