Right: DuPont Zytel HTN polyamides are used in


Technyl Star grades, two of them using bio-based, Technyl eXten technology for applications needing high temperature combined with glycol resistance. The range will be commercially available early next year. “Halogens and phosphorous in polyam- ide have been identified as major contribu- tors to galvanic corrosion, a potential source of system failure and short-circuits which could lead to fire,” says James Mitchell, Automotive Market Director for Solvay’s Performance Polyamide global business unit. Solvay says that for fuel cell stack components,

Technyl One has emerged as a preferred material choice, offering more value to customers when compared to polyphthalamide (PPA) compounds in terms of both in-use performance and processabil- ity. This material combines a near-zero ion migra- tion potential with high heat resistance, dimension- al stability against hydrogen leakage, electrical insulation, high surface aspect and weldability. Mitchell says this is the first PA66-based offer on

the market specifically designed for fuel cell technology. It is intended for applications such as hydrogen manifolds, heater plates, humidifiers and water traps.

Below: E&E parts are a common application for DSM Stanyl PA 46

Also pushing automotive applications is DowDuPont. At Fakuma, its DuPont Transportation & Advanced Polymers business introduced high temperature polyamides for SMT connectors as well as to address the trend towards miniaturisa- tion. Zytel HTN FR42G30NH is based on a new polymer, which is partly bio-based. It has a CTI of 600V and a V-0 rating at 0.4 mm, using a halogen- free flame-retardant package. It is designed to withstand high constant-use temperatures found under the hood of around 130°C. It is also intend- ed as a replacement for thermoset resins in applications such as miniature circuit breakers.

In September, the company said that with the market for electric/

hybrid-electric vehicles experiencing strong and sustained growth, it was launching Ahead, a new initiative “designed to bring customers solutions and material capabilities from across the new DuPont.” Its aim is “to bring innovative and holistic solutions to this market, including autonomous driving, connectivity and related infrastructure.” The company says that, utilising not only engineering thermoplastics but also elastomers, fluids and specialty lubricants, electronic materials, high-performance fibres and safety materials, Ahead will provide innovative solutions for light- weighting; battery pack components and assem- bly; thermal management/safety; electric motors; powertrain/chassis; electrical/electronic applica- tions for improved automation; and support infrastructure (plug-in and induction charging stations, etc.)

Automotive is obviously a major market for all

sorts of polyamides – and that is unlikely to change any time soon, even as drive systems move from petrol and diesel to electricity. Joost d’Hooghe, Global Business Director at DSM Engineering Plastics, says that during the move from petrol- powered to electric vehicles, there will still be a considerable transitional phase during which many vehicles will have hybrid electric drives. Hybrid drive systems will be an important part of the picture well into the future, until fully electric vehicles have the range that current petrol engines have, and/or can be recharged much more quickly and easily than is the case today. A list of new requirements from OEMs and Tiers

is emerging for hybrids, as both types of drive systems have to fit into the same space. Electrics and electronics have to fit into tighter spaces than in conventionally powered vehicles, for example. So cable channels, normally made in PA 6 or 66, may be produced in products like DSM’s Stanyl PA46, if they are positioned next to exhaust systems as they pass from the batteries to the electric motor. DSM has developed a 15% glass reinforced grade of Stanyl for this application. There is also much demand for innovations connected with smaller IC engines. “So the classical solutions we have been developing will

50 INJECTION WORLD | November/December 2018

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