I have done these pyrex casserole dishes since I got my laser a couple years ago, usually no problems. I picked up some new Pyrex dishes for some Christmas presents for the nieces and nephews and ran into some major problems. The glass looks like is it cutting well, but once you go to clean them, they chip and flake out. I did three and two are real bad, one not so much, the bad ones have square features the not so bad is all curves and such. Power and speed are 100% power, 23% speed and 300DPI, using my ULS 50 watt laser, which is recommended settings and what has worked for me in the past.

Any suggestions as to less power, more/less speed or anything else to stop the flaking?

This one looks good in person, not so good in the photo:

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This one is bad no matter how you look at it:

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And a closer view:

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