MATERIALS | HIGH TEMPERATURE PLASTICS
Characteristics
Humidity absorption [%] TG
(dry) [˚C]
TG TM
(cond.) [˚C] [˚C]
Test mthod
70˚C, 62% r.H. ISO 1110 DIN EN 11357-1 DIN EN 11357-1 DIN EN 11357-1
Comparison of selected properties of different PPAs from Akro-Plastic
and consumer electronics,” he says. “Electric and hybrid vehicle batteries and wiring harnesses expose connectors to high voltages and currents, requiring robust materials. As more vehicle functions become electrified, new safety, naviga- tion and infotainment capabilities are added and autonomous vehicle development continues, the industry requires connectors that can deliver high-speed, high-bandwidth and high-power signals to and from every sensor.” Two recent high-temperature additions to
Comparison of stress at break properties, dry as moulded and conditioned, for Akro-Plastic compounds based on different PPAs
tions that better serve their unique set of require- ments. This often results in improved performance and/or capabilities for the next generation of existing applications, and the design of new products addressing spaces previously out of reach.” RTP’s Weishalla says that although new PPAs
have expanded the potential operating environ- ments and applications for PPAs, the trade-off between performance and economics “is a delicate balance. There will still be plenty of room for the more economical conventional grades in most applications.”
Enabling smaller connectors In consumer electronics, most manufacturers of printed circuit boards (PCBs) have moved to surface mount technology (SMT), which exposes connec- tors to the high temperatures (sometimes as high as 280°C) of reflow soldering. At DuPont, marketing manager Christophe Paulo says that as phones and other devices become smaller but more powerful and sophisticated, PCBs must accommodate more connectors on the same or less real estate, driving the need for miniaturised, thinner-wall designs. Another connector challenge is reducing halide content in plastic materials to avoid post-soldering corrosion and improve sustainability. “The shrinking size and increasing capabilities of
electronics are driving demand for lighter, smaller and thinner-walled connectors that can withstand elevated temperatures, most notably in automotive
42 INJECTION WORLD | September 2019
DuPont’s portfolio of high-performance materials for connectors are Zytel HTNFR42G30NH, a glass-reinforced, bio-based, non-halogenated flame-retardant polyamide, and DuPont Zytel Plus 95 G35DH1 polyamide with proprietary Shield Technology to enhance heat-aging performance. Zytel HTNFR42G30NH, which Paulo says is the
first of a new family of high-heat materials, is aimed primarily at connectors used for SMT operations. The material meets the UL 94 V0 flammability rating at 0.4 mm and offers superior flow and a 600-V CTI. Connectors moulded in this material show no blistering at SMT reflow temperatures of 280°C. A combination of high flow and improved weld line strength gives designers greater flexibility to create miniaturized components such as multi-pin, fine pitch and low height connectors, he notes. Zytel Plus 95 G35DH1 provides high perfor- mance — including high-temperature resistance — for less money than PPA and other high-temperature resins, Paulo says. Targeted for automotive connec- tors, this material also offers good flammability performance and resistance to road chemicals, hot air and hot oil. Its low-halide content, due to the organic heat stabilisation and additive system, improves reliability in electronic components. “Continuous moulding trials with Zytel HT- NFR42G30NH polyamide demonstrated lower machine corrosion compared to PA 9T and PA 4T based products, helping to reduce tool mainte- nance,” Paulo further notes. DuPont continues to develop new products for
its Zytel HTN family to keep pace with demands for higher-performing connectors across multiple industries, including appliances, lighting as well as
www.injectionworld.com
AKROMID T1 GF 50
0.9
120-125 80
310-315
AKROMID T5 GF 50
0.8
130-135 90
320-325
AKROMID T9 GF 50
0.4
120-125 100
295-300
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