MATERIALS | ELECTRICAL & ELECTRONIC
Circuit breakers (these are from Eaton) safeguard circuits and, in an emergency, cut off the power supply within millisec- onds. Flame-retardant plastics used in these products have to meet high require- ments in terms of their mechanical properties and fire behaviour
good IPT voltage for our material of 1 kV at 60 minutes tracking time. That means it’s also suitable for components used in high- voltage battery systems in electric cars,” explains Radeck. The second new PA 6 contains over 50% glass fibres. With its halogen-based flame retardance package, it achieves V-0 at 0.75mm and a 5VA classification. It fulfils GWIT requirements at 775°C. “With these results, the material is destined for components subject to high mechani- cal stress, such as in household appliances (IEC 60335-1). It also has great opportunities for use in housing parts and
Solvay’s polyamide portfolio to its own after announcing an acquisition deal in September. Ultramid B3U31G4 is available now in white and
in several shades of grey. Further grades for this specific application are under development and should be ready for market during the first half of 2018.
Lanxess is working along similar lines. It recently
Right: New materials are put through their paces at Lanxess
expanded its portfolio of Durethan B flame-retard- ant PA 6 compounds with two new grades that are highly reinforced with glass fibres. Lanxess says they are ideal for components subject to high mechanical load, such as structural parts in industrial machines that must meet flame retard- ance requirements, and moulded case circuit breakers (MCCB). “In addition, they are a substitute for die-cast metals and thermosets, when the high stiffness of these materials is not needed,” says Alexander Radeck, applications development expert in the High Performance Materials business unit.
Durethan BKV45FN04 contains 45% short glass
fibres. Its flame retardance package contains no halogens or red phosphorus, and so can be easily coloured. It has a V-0 rating at 0.4mm and a 5VA at 1.0mm.
With a CTI of 600 volts, the material is highly
resistant to tracking. Electronic assemblies can therefore be positioned closer together without resulting in shorts or device defects caused by leakage current. Another of the material’s strengths is its high-voltage tracking resistance as measured according to DIN EN 60587 and ASTM D2303 (inclined plane tracking, IPT). The test recreates how strongly the insulating capacity of a surface changes at high voltages outdoors when exposed to moisture and soiling. “The Yellow Card lists a
54 INJECTION WORLD | October 2017
www.injectionworld.com
covers of circuit breakers,” says Radeck. The compound’s CTI tracking resistance is 575 V (PLC 0 on UL Yellow Card). Radeck says that despite their high fibre loadings, both new grades display excellent flow properties. DSM claims to be the first plastics producer in the world to offer materials that simultaneously meet the highest flame resistance requirements of standards organisations all around the world and which also have the required electrical properties. It says that with specially developed Akulon SafeConnect PA 66 and EcoPaXX PA 410 grades, “DSM has a complete portfolio of polyamides that not only enable OEMs to meet the EN 60335-1 international standard on safety of household and
PHOTO: BASF
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