Silicon-based materials Elkem ASA says it has successfully validated a proof of concept for a mechanical recycling process for High Consistency Rubbers (HCR).
The solution enables the recycling of crosslinked HCR waste and the reintroduction of the recycled material into new formulations. With re-incorporation rates exceeding 50% and excellent mechanical properties of the resulting material, Elkem says it demonstrates how advanced material engineering can unlock scalable circular approaches for high-performance silicone elastomers.
The method, which comes after 2 years in R&D, expands Elkem’s silicone recycling strategy, now covering both chemical and mechanical recycling routes. The integration of several recycling approaches allows Elkem to tailor solutions based on waste type, carbon footprint goals, and desired product performance, it adds.
This development is one result of the open project “Renov” (Recycling & Reincorporation of Elastomer Materials), whose goal is to develop technologies for the characterisation and recycling of crosslinked elastomer waste, enabling optimal reintegration into formulations containing virgin elastomers for identical applications. It also aims to evaluate market acceptance for new materials such as mechanically recycled HCR to help pinpoint applications creating the most environmental and commercial benefits.
Launched in 2023, Renov brings together Elkem, Hutchinson, Nexans, and CNRS-affiliated laboratories IMP, CP2M, and ISA, including Axel’One work, supported by the French environment agency ADEME.
High Consistency Rubbers, also known as Heat Cured Rubbers or High Temperature Vulcanising silicone rubbers (HTV), exhibit exceptional mechanical strength, stability over time, and electrical insulation properties. They are chemically inert, nonflammable, and thermally stable at temperatures ranging from -120°C to beyond +300°C depending on the grade. These unique properties make them essential materials in a wide array of applications, including electric and hybrid vehicles, aerospace and defense equipment, medical tubes and catheters, temporary and long-term implants, electronic devices, kitchenware and other consumer applications.
Elkem will showcase recycled material samples and discuss mechanical recycling technology at K2025, in Düsseldorf, Germany. Meet the company’s technical and sustainability experts in Hall 7A, stand B16.