Swiss researchers develop material that could make aircraft recyclable

Aircraft and train components built from composite materials could gain a route out of landfill and incineration. Swiss researchers have developed a multilayer material that combines the properties transport manufacturers demand with a process for recovering its ingredients at the end of a component’s life.

The Swiss Federal Laboratories for Materials Science and Technology, known as EMPA, announced the development on September 1, 2026. The work targets a persistent problem in transport manufacturing. Composite structures can deliver low weight, strength and fire resistance, yet their ingredients are difficult to separate once bonded together.

That difficulty matters in aviation, where reducing weight helps limit energy use, and in rail transport, where panels and interior structures must withstand demanding operating conditions. Conventional composite parts often rely on epoxy resins that cannot be melted or dissolved after curing. Disposal therefore commonly means sending them to landfill or burning them.

EMPA’s material introduces a phosphorus-containing molecule into the resin. The additive provides flame resistance and gives the cured resin a route back to a softened, reshapeable state under controlled conditions. The researchers say the material meets current fire-safety requirements and retains almost the same mechanical properties as conventional epoxy resin.

Three engineered layers give the material its transport-grade structure. At the centre sits a heat-resistant aramid honeycomb, a lightweight structure that supports the surrounding skins. Layers of glass or carbon fibres provide reinforcement, while epoxy resin binds the assembly into a rigid composite.

The resin chemistry is the key change. Researchers added a phosphorus-containing molecule that alters how the epoxy behaves after curing. Under specified conditions involving heat and solvent, the resin can be softened again. That allows the layers to be separated and the material to be reshaped, a capability conventional cured epoxy generally lacks.

The process is intended to recover the composite’s main components rather than discard the finished panel as a single mass. EMPA says the aramid honeycomb and the glass or carbon fibres can be retrieved after the breakdown process. Recovery could give manufacturers more options when repairing, remanufacturing or replacing components.

The published results also address a major barrier to transport use. The new material meets current fire-safety requirements, while its mechanical performance is described as almost equivalent to that of conventional epoxy resin. The source does not provide a quantified recovery rate, energy balance or life-cycle emissions estimate.

Recovering fibres and the honeycomb core could reduce the disposal burden from composite parts. Aircraft and train manufacturers use these materials because they deliver several performance requirements at once. Their end-of-life treatment has remained difficult because the resin locks the layers together permanently in ordinary systems.

A recyclable composite could change the options available for parts that have reached the end of their service life. The recovered glass or carbon fibres and aramid structure could potentially re-enter manufacturing streams, while the resin’s ability to soften and reshape may support reuse of the finished material. The project’s stated aim is complete recycling of the composite’s constituent parts.

The environmental benefit remains a prospect rather than a measured result in the information released by EMPA. The source gives no figures for avoided landfill, reduced incineration, energy consumption or greenhouse-gas emissions. Those figures will matter when manufacturers compare the new process with producing virgin fibres, resin and honeycomb structures.

The approach also has relevance beyond aviation. EMPA is examining possible applications for the plastic in the energy and construction sectors, where lightweight, fire-resistant and durable composite components are also used. Any wider climate benefit will depend on collection systems, solvent recovery and the energy required to process the material.

Scale will determine whether the laboratory material can reach aircraft and trains. EMPA identifies larger-scale manufacturing and recycling as the next stage of the project. That work must show that the material can be produced consistently and recovered efficiently beyond laboratory samples.

Transport manufacturers will also need evidence across the full life of a component. The published results establish that the composite meets current fire-safety requirements and has mechanical properties close to conventional epoxy resin. Commercial adoption will require the research team and industrial partners to translate those findings into repeatable production and recovery processes suited to real components.

Elantas, the project’s industrial partner, is involved alongside EMPA, with financial support from Innosuisse. That partnership gives the work a direct connection to industrial development while the researchers continue to investigate applications in other sectors.

No timetable for commercial deployment is given. The route ahead therefore runs through scale-up, process validation and application-specific testing. If those steps succeed, Switzerland could contribute a materials solution to a problem shared by aircraft and rail operators worldwide: how to retain the performance benefits of advanced composites while creating a practical end-of-life pathway.