Laminate should crack under heat as it’s cut with fire/heat application along with scoring, I’m not sure how pyrex or oven door glass is made.
If you want to use 1/8 glass for lapping or tool sharpening send me a size you want and il quote the shipping for you. I don’t have any 3/16 or 1/4 scrap available currently.
A 1/2 thick piece of glass made for lapping is 20$ on Amazon. I’m not sure if I can ship anything for much less then that. The reason people use thicker glass for those purposes is it bends less. I can bend a rip of 1/8 several inches before it breaks.
That being said In desperation I did use a mirror to redeck and flatten an engine block. And that worked so precision is relative to the task I suppose.
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