DSM Engineering Plastics has announced a new addition to its Arnitel line of copolyester thermoplastic elastomers (TPEs) that is designed to meet the stringent performance and compliance needs of today's automotive designers. Arnitel C, a breakthrough technology for wire and cable coating, delivers the best high-heat aging performance of any TPE-E, combined with halogen-free flame retardance and hydrolysis resistance that surpasses that of other copolyester elastomers. Thanks to its excellent abrasion resistance, this new material offers designers the ability to reduce the weight and mass of wiring and cable through ultra-thin-wall coatings. In addition to automotive engine cables, Arnitel C is ideal for other extrusion applications including cable harness components, convoluted tubes and hoses.
Arnitel C TPE offers a number of advantages over traditional materials. Ethylene tetrafluorethylene (ETFE) is significantly more expensive – at a higher density – than Arnitel C and is not halogen-free. Compared to the DSM material, cross-linked Polyethylenes (XPE's) resins for this temperature segment are not available in halogen-free formulations; in addition, they require post-processing E-beam treatment. Arnitel needs no plasticizer to enhance flexibility, which translates into low outgassing and no environmental issues. The combination of this polymer with the halogen-free flame retardant system also gives low toxicity and smoke in case of a fire.
The new DSM material provides the best high-heat aging properties of all TPE-Es, with a continuous operating temperature rating of 3,000hrs at 175°C; therefore, it exceeds the requirements for temperature class D under ISO 6722. Arnitel C also is hydrolysis-resistant (>150 days at 85°C in water), and on par with all other higher standard copolyester elastomers. In addition to its unique combination of heat and hydrolysis resistance, Arnitel provides excellent abrasion resistance (five times more cycles than ETFE or XPE in the needle test), excellent flexural fatigue resistance, and good resistance to automotive fluids and other chemicals. The material has been tested and approved according to ISO6722 and LV112.

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