September 16, 2025 15:47

European provider of advanced silicon-based materials Elkem will present at K2025 in Düsseldorf a new technology — still at the proof-of-concept stage — for the mechanical recycling of high consistency rubbers (HCRs).

According to the company, up to 50% of crosslinked HCR waste can be reincorporated into new formulations while maintaining solid mechanical properties. To demonstrate this, Elkem will display samples at the fair made from silicone elastomers containing recycled content.

“After two years of development, we are proud to present a first proof of concept for mechanical recycling of HCR, opening the door to new industrial applications and reinforcing our ambition to leverage pragmatic, science-driven solutions to lead and accelerate the transition to a circular economy for silicones,” said Joséphine Munsch, R&T sustainability leader at Elkem.

The project is part of the open innovation initiative RENOV (Recycling & Reincorporation of Elastomer Materials), which aims to develop technologies for characterizing and recycling crosslinked elastomer waste, enabling its reintegration into formulations containing virgin elastomers for the same end-use applications.

High consistency rubbers (HCRs) — also known as heat-cured rubbers or high-temperature vulcanizing (HTV) silicone rubbers — are elastomers known for their mechanical strength, long-term stability and excellent insulating properties. They are chemically inert, flame-retardant and thermally stable across a wide range of temperatures, from –120 °C to over 300 °C, depending on the grade.
Key applications include electric and hybrid vehicles, aerospace and defense equipment, medical devices (tubes, catheters, temporary and permanent implants), electronic components, kitchenware and other consumer goods.

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