Electronics May be Recycled by Adding Water

The National Physical Laboratory (NPL) has developed a printed circuit board (PCB) whose components can be easily separated by immersion in hot water. The work was part of the ReUSE project, funded by the UK government's Technology Strategy Board.

The electronics industry has a waste problem - currently over 100 million electronic units are discarded annually in the UK alone, making it one of the fastest growing waste streams. It was estimated in a DTI-funded report that around 85% of all PCB scrap board waste goes to landfill.

The aim of the ReUSE (Reuseable, Unzippable, Sustainable Electronics) project was to increase the recyclability of electronic assemblies, in order to avoid an ever-growing volume of waste.

The project partners designed, developed and tested a series of unzippable polymeric layers which, while withstanding prolonged thermal cycling and damp heat stressing, allow the assemblies to be easily separated at end-of-life into their constituent parts, after immersion in hot water. This revolutionary materials technology allows a staggering 90% of the original structure to be re-used. For comparison, less than 2% of traditional PCB material can be re-used.

The developed technology lends itself readily to rigid, flexible and 3D structures, which will enable the electronics industry to pursue new design philosophies - with the emphasis on using less materials and improving sustainability.

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