I thought Monocrystalline silicon was essentially glass? Ie. non-hazardous.amberwolf wrote: ↑Mar 09, 2018 5:11 pmCouple decades ago, these would be found in bins in the local Intel disused-equipment auctions. Sometimes even the end of the whole wafer cylinder (where it tapers to a point) would be there.
But nowadays that's all hazardous waste, and gets handled by e-waste companies, so you might have to check with that sort of place.
Otherwise, direct ifrom wafer-processing plants would be your first best bet, making friends with someone in the fab areas to see if they can take such scraps home (unlikely, due to the hazmat regs these days, if nothing else).