I am assuming it’s Durable… I have never used the Accura Bluestone, only heard about it. Thoughts?
Compare the technical data sheets, and you will find that Accura Bluestone is an extremely stiff material - your best bet would be Rigid, probably, but even Rigid only has half the stiffness. If you are after the high temperature properties, High Temp would be better, of course.
Same answer as @P3D : I have only once handled an Accura Bluestone part but we ordered it for its ability to support thin-walled parts while being very rigid. Looking at the TDS I would also tend to recommend Rigid. Rigid will be less stiff than the Bluestone and possibly a bit more brittle depending on the use case, but the only other alternative is high temp which is probably faaaar to brittle, but again it depends on your application.