I mean this has to be tested. "Biodegradable" can come in many flavours. For a single use product it would make sense to rot within months. For a PCB it would m

I mean this has to be tested. "Biodegradable" can come in many flavours. For a single use product it would make sense to rot within months. For a PCB it would make sense to rot within multiple decades to a century. If you manage to get a PCB that has all the properties of a regular PCB, but rots after a century that would probably also make recycling the other materials on that PCB less energy intensive.