MATERIALS | ELECTRICAL & ELECTRONIC
Blistering resistance
Toughness
CTI
Comparisons of key properties for electronics of ForTii, rival PPA, and LCP Source: DSM
achieves the best rating of 5VA at just 1.0 mm,” says Alexander Radeck, applications development expert in the High Performance Materials business unit at Lanxess. “The material is unusually stiff and strong,”
Right: Connectors in DSM’s ForTii
Radeck adds. Tensile modulus is 16 GPa (freshly moulded). Further advantages include its high tracking and thermal aging resistance. He envisages its use in structural components, for replacing thermosets and die cast metals, and for large connectors and moulded case circuit breakers (MCCBs). With a CTI of 600V, the material is
Below: PCB connectors are made in highly reinforced HFFR PA6
highly tracking resistant. This means that electronic assemblies can be positioned close together without resulting in shorts or device defects caused by leakage current. The material also shows high-voltage tracking resistance in the DIN EN 60587 and ASTM D2303 Inclined Plane Tracking (IPT) test, which indicates how strongly the insulating capacity of a surface changes at high voltages outdoors when exposed to moisture and soiling. “The Yellow Card lists an IPT voltage 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,” says Radeck. Lanxess has since introduced an HFFR PA6
containing over 50% glass fibres, which achieves V-0 at 0.75 mm and 5VA. Radeck says the product easily fulfils glow wire ignition temperature (GWIT) requirements at 775°C. “The material is destined for components subject to high mechanical stress, such as in household appliances conforming to IEC 60335-1. It also has great opportunities for use in housing parts and covers of circuit breakers,” he says. CTI is 575 V (PLC 0 on the Yellow Card). New HFFR PBT compounds in the Pocan BFN product line, unveiled at the SKZ event in Würzburg, are said to be a good alternative to their counterparts containing halogen-based flame retardants. For example, they display better electrical behaviour and higher thermal and colour stability. They pass the UL 94 standard fire tests of the US testing organisation Under-
writers Laboratories, achieving the best classification of V-0 for a test specimen up to 0.4 mm thick. In October, Lanxess further expanded its
portfolio of HFFR compounds based on PBT. “In terms of properties and processing, our new materials are on par with, or even superior to, their counterparts containing halogen-based flame retardance packages,” Radeck says. New additions to the Pocan BFN PBT product line include Pocan BFN2502, BFN4221 and BFN6410.
Laser weldability A compound currently under development shows “outstanding” results in glow-wire testing to IEC 60695-2-10 (see IW Nov/Dec 2017). “Our material proves that not only halogen-based, but also halogen-free flame retardance packages can support good glow-wire resistance levels in PBT compounds,” says Radeck. It has the potential to pass the stricter glow-wire tests required under IEC 60335-1 for unattended household appliances (“no flame”).
32 INJECTION WORLD | March 2018
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PHOTO: LANXESS
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