Researchers at ETH Zurich have found a practical new method that breaks down acrylic glass—known by the brand name Plexiglas—almost entirely into its original building blocks, making high-quality recycling realistic and affordable for the first time.
Acrylic glass shows up in everyday products like windows, car taillights, furniture, and protective barriers. Most of it has ended up as waste because older recycling methods were too costly, too energy-intensive, or too complicated for companies to adopt.
The new process changes that. Using a single, inexpensive chemical that’s already available, the team recovered up to 98% of the material as pure monomers. The reaction starts at just over 200°C—about half the heat required by previous methods—and needs no solvents.
Even when the original acrylic was dyed or contained impurities, the recovered material was pure enough to make new products of the same quality as virgin plastic.
Because it works with existing equipment and standard processes, companies wouldn’t need expensive overhauls to start using it. ETH Zurich has filed a patent and is already seeking industry partners to scale the method. The researchers also hope the same basic idea can eventually be adapted for other common plastics, such as polystyrene.
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“What makes our new approach so exciting is its simplicity,” said Richard Whitfield, lead author of the study published in Nature Chemistry.
For a material used in millions of products around the world, this is a hopeful step toward keeping more plastic out of landfills and turning waste back into useful, high-quality goods with far less energy and cost.
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