[mura_gadi (Steve)]

Hello,

I am after a simple test for checking my numerous unlabeled glass blanks I recently became the proud owner of. Soda glass is easy, I can just check to see if the edges are green on the blank. The Pyrex over fused silica is proving to be a lot harder to find an answer for though.

While I have numerous labeled Pyrex 6" blanks in cardboard packaging, I also have a few that are packed in wooden boxes and that makes me think they might be fused silica blanks. Wishing thinking maybe, but both the wooden box and the internal packaging seems a step up from the rest of the items on offer.

Weight doesn't seem to get me a good answer, pyrex comes in at 2.2g/cc and fused silica at 2.2-2.23g/cc. I'm thinking my kitchen scale will struggle with that at 6" blanks as they're pretty cheap.

I'm after suggestions that can be done at home, or with minimum expense, laser pens/pointers and scatter patterns maybe?


Thanks
Steve