All plastic frames are fine for beekeeping. Bees dont know the difference between wood and plastic and dont care. They're very good for honey supers and last forever. The only issue for me is brood frames. Brood frames need to be rotated out as they get old. Bees wax holds disease and chemicals overtime that can affect brood and queen rearing. Pushing out old plastic foundation from wooden frames and putting in new ones for me is easier and cheaper overall. Plastic foundation got bad reviews when it first came out because of poor wax application. Thats changed, extra heavy waxed foundation is available.
I doubt that any commercially sold frames are still made in the USA now. And i am not so sure about what kind of wood is being used for frame-parts nowadays - in China! They fake everything.
As far as I know almost all frames and woodenware are made in the USA including high end beekeeping equipment. For woodenware, Humble Abodes/Betterbee, Miller Bee Supply, Hansen Honey Farm, Western Bee Supply, Dadant, are just the ones I know off the top of my head. Im sure there are plenty of others. USA plastic frames, Pierco (I dont recommend), Acorn, Premier, (both excellent). High density poly hives USA made, Superior Bee. In my opinion the very best honey processing equipment is Maxant, my extractor will last for generations. Dadant is also USA made HPE. If you want to go big or go home, Cook & Beals
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Locally for me there are Amish that make great woodenware for a great price.
Almost forgot: Pierce Beekeeping makes great USA made uncapping knifes and tools.
