These chairs broke, so they came my way for recycling. I took them apart, with the intent of the frame going for scrap-metal recycling, and the seat and back (very helpfully marked with a #5) going for plastics recycling, and then it dawned on me: wouldn't it be so much better to see if the chairs can be repaired? (Each was broken in just one place.) So that's what I did. Took them to a welding shop, and $32 later, here they are, all fixed and ready for (hopefully) years' more service.