Avian’s Blog

I bought a couple of coasters like this yesterday at Science Museum. They claim that they are made from recycled printed circuit boards.

From a close look they appear to be made out of a double-sided 6-layer PCB. I doubt that it is recycled though. You can see the gold colored metallization on SMD pads that would be covered if the pads ever had any solder on them. It is more likely that the material came from some stock of obsolete boards that were never assembled.