W-temper aluminum sale and incomplete heat treatment
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Recent (~one year prior) case where someone shipped material in W-temper (solution heat treated but not precipitation hardened) and the buyer didn't complete the heat treatment. Tom cannot recall the specifics.
There are whole books written about aluminum tempers. You can buy a book and the whole book just tells you all the variations on aluminum tempers. Here's something I hadn't seen before, about a year ago — W temper. That's where it's been solution-heat-treated but you haven't done anything to precipitation-harden it yet. I had a case — I can't remember the situation right now — where someone was selling something in a W temper and they were supposed to heat treat it later, but they didn't.