It's grade 1 unalloyed titanium from Snow Peak: https://www.snowpeak.com/blogs/explore/ultralight-everything with the lowest oxygen content. Your hazard warnings are noted though, and I definitely will keep it at lower temps.

I've also got their titanium flask. I had it engraved from a random guy on youtube who had experience engraving on Ti, because everyone else I contacted (mostly jewelry shops) could only anodize it.