Fraunhofer project develops PFAS-free elastomers and coatings
In view of possible PFAS restrictions, a new Fraunhofer project is working on fluorine-free alternatives for technical applications. High-performance elastomers as well as paint and plasma coatings are to replace fluoropolymers in seals and components in the future.
The potential regulatory handling of polyfluorinated and perfluorinated alkyl compounds (PFAS) presents many industrial users with new challenges. Fluoroelastomers in particular have so far played an important role in numerous technical applications, for example in medical technology, plant and mechanical engineering, semiconductor production and chemical process technology. As their use could be restricted in the long term, the need for high-performance alternatives is growing. With this in mind, experts from the Fraunhofer Institute for Structural Durability and System Reliability LBF and the Fraunhofer Institute for Manufacturing Technology and Advanced Materials IFAM have launched the "Hate-Fluor" research project. The aim is to develop fluorine-free high-performance elastomer compounds that can replace fluoropolymers in certain technical applications. In addition to new material formulations, suitable coatings are also to be developed to ensure the required chemical and thermal resistance.
PFAS replacement: coated elastomers and customizable modular solutions
The project pursues a modular approach to the development of PFAS-free functional materials. A first step is to improve the thermal and thermo-oxidative stability of fluorine-free elastomers by using novel antioxidants. In parallel, application-specific elastomer formulations are being developed that guarantee high resistance to aggressive media. In addition, a coating system is being developed to protect the elastomers from chemical attack and oxidative ageing. Paint and plasma coatings are used here, which act as a functional barrier and can also improve the frictional properties and service life of the components. One focus of the work is on polyimide coatings in combination with layered silicates. These material systems can significantly reduce the permeation of gases and moisture and thus protect sensitive components. Studies show that the permeability for water vapor and oxygen can be reduced by up to 99 percent by suitable modification of the phyllosilicates. Such coatings are particularly relevant for applications in high-performance electronics or in corrosion-critical environments. The three-year project is being funded as part of the Fraunhofer Prepare program and aims to open up new material technology approaches for PFAS-free industrial production.