Hmmmm -- that does make a difference, so I googled "Polyphenylene Oxide welding". The Handbook of Adhesives and Sealants says "PPOs are usually joined by solvent cementing or thermal welding", and names some solvents, but says the joints must mate almost perfectly to be strong. The Handbook of Plastics Technologies says that "Unmodified PPO can be welded at hot plate temperatures of 343°C", where modified PPO welds at lower temperatures. But I believe hot plate welding is very different from the sort we'd do with the KC Welder Pro.
It might be good to send the guys at Urethane Supply an email and see what they recommend.



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