This is something I’m interested in. There are strong plastics, but a lot of stuff nowadays seems to be the cheapest plastic imaginable. Anyway to know if what you’re getting?
I don't think so. MFGs are likely to swap in new parts without notice --they may keep track through serial numbers, lots or similar, but not something they would expose to end users.
Take it apart and see? If you have experience you can usually roughly tell what kinds of plastics are used, although some are nearly indistinguishable.
Walk in to an appliance store or website, or someone's house or a car park if secondhand, with your tool kit and expert knowledge and do a full teardown on anything your considering purchasing.