MATERIALS | ELECTRICAL & ELECTRONIC
Right: A. Schulman says Polyflam PP-based grades can be used for
connectors in appliances
moulded connectors. The company has numerous PP-based Polyflam grades that carry an RTI of 130°C and which it claims can be used to replace more expensive polymers, including polycarbonate and polyamides.
Another specialist compound-
er, Akro-Plastic, will be showcas- ing what it says are innovative new halogen-free flame retard- ant (HFFR) compounds at the Fakuma show in Friedrichshafen, Germany (see Fakuma Preview feature). Two new Akromid grades are aimed at applica- tions in railways. Akromid B3 1 FR black (5983) non-reinforced PA 6 complies with the specifica- tions of the European railway standards EN 45545-2 with the requirements R22/HL3, R23/HL3 & R26/HL3. The supplier says the material is ideal for isolators, switches, relays, fittings etc. To comply with the EN 45545-2 standard specifications R24/ HL3, Akromid B3 GF 30 FRT black (6665) has a UL94 HB rating at 0.8 to 3.0mm.
HFFR compounds
Other new HFFR compounds are available for the broader electronic and electrical sector, as well as automotive applications where resistance to corrosion is paramount, according to Günter Prautzsch, Business Development Manager for Innovative Products at Akro-Plastic. “For the product series Akromid A3 GF 30 to GF 60 HU, we have managed to complete the UL yellow card with RTI listing,” he says. Ed Nerlich, Global Segment Leader, Consumer & Industrial at Ascend Performance Materials, highlights the company’s J Series of electrically neutral, heat-stabilised glass reinforced Vydyne PA66 grades. These contain what he says is a unique organic heat stabiliser, and are proving successful especially in automotive electronic applications where compounds containing more traditional copper-based stabilisers run into trouble with corrosion of the connections. The Ascend compounds also boast a CTI (comparative tracking index) of 600 V. Nerlich further highlights their high flow – important for thin-wall parts – and low plate-out, which extends the interval between mould cleaning maintenance operations. Vydyne FR350J, introduced around the begin-
ning of the year, has been developed for connec- tors and other components used in appliances (attended and unattended). This is an unfilled PA
52 INJECTION WORLD | October 2017
66 that has an Electrical RTI (relative temperature index) rating of 130°C, a GWIT (glow wire ignition temperature) of 960°C, and a UL94 V-0 rating at 0.4 mm. “It stands out for the high GWT (glow wire test) temperature that users can obtain in finished products, which in the end is what counts,” says Nerlich. “750°C is typical, but with our product customers are getting over 775°C.” He also points out that parts can be marked using both infrared and UV lasers. BASF has just expanded its PA range to include a new flame-retardant grade for use in E&E applica- tions. “Ultramid B3U31G4 [based on PA 6] impress- es in the glow wire test, is noted for its good mechanics and good processing properties and is particularly suitable for manufacturing circuit break- ers for domestic use,” the company says. Circuit breakers safeguard circuits and, in an
emergency, cut off the power supply within milliseconds. This occurs both in the event of brief power surges or an excessive continuous load. The plastics used in these products have to meet high requirements in terms of their mechanical proper- ties and fire behaviour – glow wire test at 960°C, for example. Ultramid B3U31G4 passes this test with a wall thickness of 1mm. Likewise, the circuit breakers need to be
reusable after they have been triggered, for example after a short circuit caused by incorrect operation, or an assembly or commissioning fault. This means the housing of the circuit breaker must withstand the energy which is explosively released, so that the switch can be flipped back afterwards. “Thanks to the combination of outstanding mechanical properties with good flowability, the new Ultramid grade is particularly suitable for this application,” says BASF, which expects to add
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