Manchester, U.K. – Hexpol TPE expands its range of thermoplastic elastomer (TPE) materials with recycled content. The new Dryflex Circular TPE grades have been tested for odor and emissions performance in automotive interiors.
Dryflex Circular TPEs were developed to support the shift from finite fossil based virgin materials. They were launched in 2019. Recycled polymers from various sources, including post-consumer (PCR) and post-industrial (PIR), are incorporated into the Dryflex Circular TPEs. They can also be recycled in closed loop systems at the end of life.
An important aspect of automotive interior parts is their emission behaviour regarding odour and volatile substances. The exact specifications and requirements vary, depending on application and OEM. But generally, the material odor must not be disturbing even at higher temperatures (e.g., 80°C). A representative Dryflex Circular TPE grade, a 65 durometer A material for inlay mats with a recyclate content of 20 percent, showed a very low amount of VOC (60 μg/g) and FOG (594 μg/g).
The TPE was tested at an external accredited laboratory and shown to have almost no odor (grade 2.0 according to VDA 270, B3). The mechanical properties fulfill automotive requirements, and colorability is possible. The material is currently being approved by a German car manufacturer.
The recyclate sources are diverted from waste streams during post-industrial manufacturing processes. They originate from injection molding sprues or edge trims in extrusions. The chosen recyclates were selected due to their high levels of consistency and purity. With consideration of transportation and energy impacts, the recyclates are sourced in Europe. Dryflex Circular TPEs are produced at Hexpol TPE’s European sites, which use 100 percent renewable electricity.
The new Dryflex Circular TPEs can be used in various automotive interior applications such as inlay mats, cup holders, sealing lips and HVAC parts. Köppl added, “With the recent developments of Dryflex Circular TPE, it is now possible to realise high-performance interior applications. Together with our Circular TPE grades for exterior applications and our biobased TPEs, we are supporting automotive suppliers and OEMs to fulfil their targets to increase the use of recycled and renewable materials.”