If you fuse glass together that isn't compatible, it'll (eventually) break.
This document describes how to test glass for compatibility - so it doesn't break.
I hope that you find it useful.
Click the 'download' button to read the pdf file.
Hope you find it helpful!
Adrian

All of the tips and documents that will be published on this page are entirely free
- but if you feel that they have been helpful, and you'd like to say a little 'thank-you'
then feel free to 'Buy me a coffee' via this link. Thank you!