NASA had issues with falsified tests of aluminium not long ago[1], reportedly costing them $700 million in losses[2].

Though buying from a relatively little known Chinese vendor without thorough testing on your own seems a bit reckless.

[1]: https://www.justice.gov/opa/pr/aluminum-extrusion-manufactur...

[2]: https://www.latimes.com/business/la-fi-nasa-metals-fraud-201...