Borosilicate glass for monoprice delta mini gets warped

Hello. Yesterday i got my new cutted sized borosilicate glass from amazon for my monoprice mini delta. And i attached it to the bed and i usually heat the bed 60 degrees for pla and after few prints one of them really long one i cleaned the glass and as i felt it with my hands. It felt no longer flatted anymore with a really small mountains across the glass. I really need an explanation. Isnt borosilicate glass supposed to handle the heat well without warping? And if not then what is the uniqueness of it and what better in comparision to standard glass. Any advice what to do in this situation? Any related good ideas you can give.
Thanks a lot

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This really doesn't make any sense.  Even a regular piece at those temps should be ok.

Pictures would help some.

Do you use anything on the glass like hairspray or glue stick to help with adhesion?

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Yes I do use glue stick for adhesion with the pla

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Without any pictures it is hard to tell but you are probably seeing the residue from the glue stick.  It can build up and is not easy to get off sometimes.

 

If it really is only the glass then you probably need to return it before too much time goes by.

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Thanks a lot man i really appreciate the help. In order to clarify this. What do you suggest i use to remove the glue residue in case its really just glue to check it to the end. And really see if those tiny mountains will disappear? Thanks again

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I washed them in the kitchen sink with hot water and used one of those metal scrubbers kind of like coarse steel wool but the kitchen ones.

I would think a single edge razor blade scraper could work also.

 

It just doesn't seem likely that the glass would be having an issue but I suppose it is possible.

 

One thing I have seen over time is that little pieces of the glass surface can actually "chip" off when removing a part.

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