engineering plastics | Innovation
Right: Airbag connectors moulded in Ascend’s
Vydyne R535J NT glass
reinforced PA66
after by producers of thin-wall parts in this market. Its new J Series grades show 40% less residue than earlier types, extending intervals between maintenance operations on the moulds by as much as 25-30% and reducing the risk of part degradation. Staller says new Vydyne grades also show improved
melt viscosity and resistance to high temperatures and humidity (mostly needed for automotive engine compartment applications). Many heat-stabilized polyamides (including Vydyne H Series grades) use copper-based additives, which can corrode over-mould- ed contact pins during processing (and also react with transmission fl uids in automotive applications). Ascend’s heat stabilization technology is copper-free (and also halogen-free) so corrosion is postponed, if not eliminated. New grades are classifi ed as EN for Electri- cally Neutral and are available with various levels of glass fi bre reinforcement. At Invista, European Director Claudio Degiorgi
highlighted grades for E&E applications that display a very high Relative Temperature Index (RTI) of around 140°C (measured according to UK standard 746 to give the maximum service temperature for a material where specifi c properties are not unacceptably compromised). Like Ascend’s new grades, the Torzen Marathon types, which were fi rst shown at NPE 2012, contain no copper in their heat stabilization systems and are halogen-free. Invista also launched its Torzen high viscosity
polyamide 66 resins at Fakuma. The company says they combine wear resistance with durability, and display good retention of molecular weight during processing. “Through customer insights, we recognised a gap in the marketplace for a resin that brought toughness and wear resistance for a number of specialty applications, which are commonly known to be challenging during processing,” says Matt Osborne, Global Business Manager. He says Invista has numerous grades with different relative viscosities (80-360 according to ASTM D789), and some are available with heat stabilization
Radistrong A LFTs offer stress-strain performance similar to reinforced PPA
and lubricating additives. Target applications include gears, chain tensioners and rail isolators. The resins are also available as a compounding feedstock.
Taking on metal RadiciGroup highlighted Radistrong A, a long fi bre reinforced (LFT) polyamide 66 aimed at metal replace- ment, as well as Radilon grades (PA66 and also PA610) for plumbing applications, and a brand new fl ame retardant PA66 Radifl am product. Erico Spini, Marketing and Application Development
Director at RadiciGroup Plastics, says the company has added several specialties to its portfolio in recent years, including polyamides 6,10 and 6,12 with high chemical resistance (mostly for extrusion and blow moulding) as well as Radilon Xtreme, which is capable of service temperatures up to 230°C. Radistrong A continues that tradition. He says that, compared to short fi bre-rein- forced compounds, it offers improved tensile strength at break and better moisture resistance, while parts also display a better surface fi nish. Stress-strain curves are said to be not dissimilar to those of 50% short glass reinforced PPA. Radici offers four grades with reinforce- ment levels of 50% and 60%. Radifl am ARV250 HF 3003 BK is the company’s latest addition to its halogen and red-phosphorus-free fl ame-retardant Radifl am product line, mainly targeted at the electrical market. Characteristics of this UL94 V-0-rated 25% glass-fi bre-reinforced PA 66 include good mechanical properties and high resistance to UV radiation, weathering and hot/humid cycles. Radifl am is intended principally for electrical and electronic housings. Spini says the grade is being used in a photovoltaic converter housing for Bosch Power Tech. Evonik recently launched Vestamid HTplus M8000 for high-performance applications in the electrical and electronics industry. This is a PPA based on polyamide 10T, rather than the more common 6T, and is partly sourced from castor oil. Evonik says the new grade is
70 COMPOUNDING WORLD | March 2016
www.compoundingworld.com
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