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Halogen-free flame retardant Exolit OP enables increased recyclate percentage in E&E & automotive parts at stable flame retardancy.  (Photo: Clariant)
Halogen-free flame retardant Exolit OP enables increased recyclate percentage in E&E & automotive parts at stable flame retardancy. (Photo: Clariant)

As announced end June, Clariant is taking action to tackle the challenge of plastic pollution with new solutions and proactive steps to create a more sustainable plastics industry through a “Symphony of Collaboration”. One way to approach this challenge is to improve additives, making them fit for re-use while avoiding material performance degradation.

A showcase of this is the recycling and upcycling of flame retarded polyamide post-industrial waste. Fraunhofer LBF confirms that PA6 and PA66 engineering plastics containing Clariant’s halogen-free flame retardant Exolit OP maintain their UL 94 V-0 rating also when recycled back into production streams multiple times.

This is advantageous both for the environment and manufacturers who are keen to increase their use of production waste and post-use recyclate in electrical, electronic and automotive applications.

Even under the assumption that plastics could be re-designed to a large extent to better fit to recycling, contaminants and additives could be accumulated in the material over several mechanical recycling cycles and might lead to poor performance or even health risks.

Being phosphorus-based and halogen-free, choosing Exolit OP as a flame retardant is a safer and an environmentally superior option compared to legacy brominated flame retardants. Its use is even more relevant considering the rise in demand for PA66 engineering plastics, pushed by industry trends such as miniaturization in E&E, the shift to more lightweight materials in automotive and by rising mobility demand.

Electric vehicles have their specific material and safety requirements. Because of the high energy content of the battery and the high voltages and currents employed, not only flammability is a risk but also electrical arcing which can in turn lead to a fire.

This risk is addressed by measuring the current tracking index (CTI) where short circuiting on a surface is mimicked. In this test, Exolit OP phosphinates perform exceptionally well. Furthermore, the “signal orange” color for high voltage parts can be a challenge to achieve and maintain, in particular for polyamides, in harsh under-the-hood conditions.

Confirmation from the Fraunhofer LBF Institute over a multi-year research collaboration with pinfa that Exolit OP continues to deliver the same high-level fire protection throughout many recycling and reuse cycles is a further boost.

Stephan Lynen, Head of BU Additives, Clariant commented: “Take automobiles, one of the most recyclable engineered products, offering recovery rates of up to 90%. As the industry shifts towards a circular economy, any contribution we make to recyclable plastics that improves automotive waste management will support OEMs in selecting lighter weight and sustainable materials. With Exolit OP, OEMs can be confident of a flame retarded PA for their application which is recyclable and safe.”


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