electrical & electronic | Materials
Right: DSM claims its
Stanyl ForTii PA4T resin is well suited to production of DDR4 memory module sockets
Xydar liquid crystal polymer range designed to meet the performance and processing requirements for the latest USB 3.0 surface mount connectors. Xydar MG-850 is a high flow grade with 50% glass and mineral reinforcement designed to provide the very high levels of dimensional stability required to mould the new 12GB connectors, which use fine pitch surface mount technology to place component leads or terminations on centres as close as 0.375mm. “The connector industry’s adoption of advanced
Below: The FR4000 range of Bayblend PC/ABS polymers are suitable for portable computer casings
fine-pitch technology has placed even more exacting demands on materials,” says Cupta,. “Xydar MG-850 LCP offers manufacturers exceptional performance for these next-generation connectors, providing even tighter tolerances and lower warpage compared to our standard LCP material.” The MG-850 LCP provides a heat deflection tempera-
ture of 271°C and infrared reflow capability up to 260°C. It is inherently flame retardant (offering a UL94 V-0 rating at 0.2mm with no additives), transparent to microwave radiation and resistant to most chemicals. The new grade is available in black or natural colour. DSM Engineering Plastics says its Stanyl ForTii PA 4T resins are proving well suited for production of the next generation of memory module sockets for high perfor- mance servers – DDR4. The new modules feature a reduced height to allow a higher chip density to be achieved
while the pin spacing has been cut by 0.15mm from current DDR3
Right: Nomad’s Clip portable
charging device is moulded in Makrolon PC from BMS
types to just 0.85mm. This, together with the longer form factor, places new demands in terms of flow and dimensional stability on the polymer. According to DSM, Stanyl ForTii H11 resin is already being used by Taiwanese DDR4 connector maker Lotes, which reports that the high stiffness and HDT properties means warpage after reflow soldering is better than LCP and PPA alternatives.
Alternative housings Bayer MaterialScience is targeting electrical and electronic housings with its FR4000 line of flame retardant PC/ABS blends. “This material targets applications where high thermal stability and resistance to weathering are important. In terms of fire resistance, these products are superior to conventional polycar- bonate/ABS blends and in many cases provide a particularly environmentally friendly alternative,” says BMS materials expert Mathieu Jung.
66 COMPOUNDING WORLD | June 2015
www.compoundingworld.com The new products offer high resistance to hydrolytic
and UV degradation, and good resistance to chemicals such as fatty acids and hydrocarbons, making them highly suitable for production of laptop computer casings and exterior housing applications. The materials perform well in both glow wire flammability and UL94 tests. BMS materials are also being used by US-based
electronic accessory maker Nomad in its range of USB charging devices for portable electronic equipment. The company has selected Makrolon 2207 PC for its durability and ease of processing for the thin wall casings in its NomadClip, NomadKey and NomadPlus units. “We chose Makrolon 2207 polycarbonate for its predictable, consistent quality from batch to batch and high-impact resistance,” says Nomad co-founder Noah Dentzel. Schneider Electric is using non-halogenated flame
retardant polymers from PolyOne in its Multifix Air range of electrical installation boxes for domestic installation. The housings, which are designed to be near airtight to improve building insulation and reduce energy losses, are injection moulded in a combination of Maxxam FR polymer overmoulded with an OnFlex TPE. Aside from the reduced air leakage – Schneider claims leakage is reduced by 95% compared with traditional alternatives – the new material combination uses less polymer and results in a lighter product. Schneider Electric has also selected a Versaflex TPE from PolyOne GLS to produce a number of functional
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