ELECTRICAL & ELECTRONIC | MATERIALS
of 600V. It has “superior” flow properties, making it suitable for parts with multiple, fine-pitch pins and low height. Its UL746B Relative Thermal Index (RTI, an indication of a material’s ability to retain a particular property when exposed to elevated temperatures for long periods) is 130°C.
New PBTs DuPont T&AP is also introducing two new fully colour-compounded grades of Crastin PBT thermoplastic polyester for applica- tions such as high-voltage connectors in the hybrid and fully-electric vehicle market. Read says the new products “meet automotive OEM safety require- ments to clearly indicate high-volt- age components in orange for use in hybrid, plug-in and battery electric vehicles. What’s more, the grades offer best-in-class CTI performance (600V) frequently requested for these demanding parts. There are benefits for moulders as well, including increased productivity and long-term reliability.” Crastin FR684NH1 OR162 is a 25% glass-rein-
forced, high-flow HFFR PBT in laser markable orange. Crastin HR5330HFS OR516 is 30% glass- reinforced, hydrolysis-resistant (best-in-class, according to the supplier), and high-flow, also in laser-markable orange. Lanxess, too, is beefing up its PBT range for E&E.
Its Pocan BFN series of HFFR polyesters, specifically designed for such applications, now includes an unreinforced version and several reinforced products with up to 25% glass fibre. All achieve a V-0 rating at 0.4 mm and exhibit excellent heat aging resistance – they have RTIs of at least 140°C. Further strengths include high stability against UV light, high tracking resistance, and a low tendency to corrode when in contact with metals, says Marc Marbach, head of the E&E sales segment at Lanxess’s High Performance Materials business unit (HPM). Unreinforced Pocan BFN2502 exhibits a high strain at break, more than 7%. “This easy-flowing material is particularly suitable for components that need to maintain dimensional stability while providing permanent electrical insulation,” says Alexander Radeck, application developer at HPM. In development is a reinforced compound said to achieve very good glow wire results both on test specimens (IEC
www.injectionworld.com
60695-2-13) and on finished parts (IEC 60695-2- 11). Radeck says it also has the potential to pass the more stringent glow wire tests described in IEC 60335-1 for unattended household appliances, meaning it will produce no flame. Polyplastics will have a strong focus on e-mobil-
ity at Fakuma, as well as on its efforts in research and development; it recently opened a new technical centre in Frankfurt. Products in its portfolio include Duracom POM, Duranex PBT, Durafide PPS, Laperos LCP, and Topas COC resins. One product under the
spotlight will be newly-developed Duranex 457EV, an unfilled, high-impact PBT which satisfies the UL2251 standard for plugs, receptacles, and couplers for electric vehicles.
Thermally conductive advances Demand for thermally conductive thermoplastics is growing in E&E applications and automotive. One reason for this is the miniaturisation of electrical and electronic components, which results in more heat being generated inside devices; another is the extra freedom that thermoplastics often offer over metals in design, processing and overall cost-effectiveness. Several companies are expand- ing their offerings in thermally conductive com- pounds, Lanxess among them, with its Durethan TC line of polyamides. These compounds are quite heavy, owing to their high filler content. In many applications, this might be considered a negative aspect, but
Left: Electric and hybrid vehicle
connectors are a target for DuPont’s Crastin PBT
Left: Polyplastics says its Durafide PPS has proven to be the right material for this motor coil for use on hybrid EVs, thanks to its high heat resistance, good electrical properties, heat shock resistance, dimensional stability and high flowability. Right: This power control unit features Polyplastics’ Laperos LCP, which the company says provides a perfect fit because of its heat resistance, low warpage and high stiffness
October 2018 | INJECTION WORLD 19
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