MATERIALS | ENGINEERING PLASTICS
DowDuPont announced at Fakuma that Schneider Electric, a global leader in energy management and automation, had selected its Zytel polyamide for the creation of a high dielectric strength housing for the high precision current sensor in its new connected Masterpact MTZ circuit breaker. It said a new halogen-free and UL certified self-extinguishable grade, Zytel FR95G25V0NH, exhibits “outstanding” performance over a long period of time, adding that the use of Zytel has resulted in a step change performance improve- ment of the high precision current sensor in the air circuit breaker. The grade is a 25% glass reinforced PA66/6T. A new product among halogen-free flame-
Above: Unattended and increasingly smart home appliances are requir- ing thermoplastics with improved performance in connectors and other electrical/electronic components
(PA66) that it says will bring extra safety to electrical connectors used in unattended home appliances. It has very good electrical and flammability properties and exhibits high ductility and elonga- tion at break (15%), providing extra freedom when designing parts with living hinges and snap fits. Flow is said to be “superior.” Vydyne FR350J has a wide processing window and is colour stable for natural and colourable applications. Smart home appliances will incorporate more
electronics and more connectors, said Vikram Gopal, Ascend’s vice president of technology. “Vydyne FR350J will make sure that appliances are safe as well as smart.” Vydyne FR350J has an RTI electrical rating of
Right: Schnei- der’s new circuit breaker uses a self- extinguishing grade of DuPont’s Zytel polyamide
130°C (RTI is the relative temperature index; RTI electrical is an indication of how critical electrical insulating properties vary with temperature) and a UL94 V-0 flammability rating at thicknesses down to 0.4 mm. The flame retardant additive package exhibits low corrosion for improved electrical contact performance. Vydyne FR350J exhibits what Ascend says is a best-in-class glow wire ignition tempera- ture (GWIT) of 960°C at all thicknesses (up to 3.0 mm). Finished parts achieved GWEPT values of 750°C at all thicknesses. Vydyne FR350J also achieves PLC 0 ratings in hot wire ignition (HWI) and high amp arc ignition (HAI) tests carried out according to UL 746A.
36 INJECTION WORLD | November/December 2017
retardant polyamide 66 grades from Lanxess is Durethan AKV30FN04LT. It is optimised for laser transmission welding, a process increasingly used for joining electrical and electronic assemblies because it is associated with only limited thermal loading and is dust-free. In black, the material’s light transmission in the standard wavelength range for laser welding is still over 50% at a wall thickness of 1.5 mm. “The polyamide 66 has a flame retardance
package whose components display hardly any tendency towards blooming, meaning that virtually no deposits form on the mould surface during injection moulding,” said Alexander Radeck, applications development expert in the company’s High Performance Materials (HPM) business unit. The compound (containing Lanxess’s XTS3 heat stabilisation system, which enables it to be used at higher continuous service temperatures) has a UL 94 flammability rating of V-0 at 0.4 mm and achieves high tracking resistance of 600 volts in tests to IEC 60112. One of its potential applications is safety switches. (XTS3 predates XTS2, which Lanxess has just used for the first time in its Durethan AKV35 XTS2 (– see IW October 2017). XTS3 is a copper- and halogen-
free version of the original XTS1 stabilisation package, both of which are suitable for up to 200°C. XTS2 is for tempera- tures of up to 230°C. The XTS3 package is especially suitable for plastic components that come into direct contact with metal components, since it helps to prevent contact corrosion, said Thomas Linder, a Durethan material development expert at Lanxess.
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PHOTO: ASCEND
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