I am using an Intamsys FunMat HT, which has a "ceramic glass" bed. I'm not sure what "ceramic glass" means, the stuff behaves like borosilicate in the way it either chips or shatters depending on how I abuse it -- so lets just go with "borosilicate bed". It has a glossy side and a frosted side, and as I have permanently damaged the frosted side, I am trying to save the glossy side with a bed surface.
I am trying to attach a sheet of Ultem PEI (McMaster link), using (3M 468MP) tape for printing Ultem 1010 filament. The 3M tape is rated to 149 C for "days, weeks" (per the datasheet), and up to 200 C for "minutes, hours". My print bed runs at 160 C, and I was printing an Ultem part on it. In under an hour, the adhesive had begun to delaminate under just the curling forces of the PEI sheet itself, save nothing of the part attached to it. The adhesive itself seemed to be peeling apart.
The bed had been baked in a convection oven at 100C for 12+ hours, and was prepped with soapy water followed by Windex and a dry-scrub with paper towels. Is there a better transfer adhesive I can use that will offer strong bonding of PEI to a glass substrate, and survive prolonged exposure to 160C temperatures?
note: I am not sure this is a duplicate of this 3dpse post, because I think I cleaned the bed well enough, and in this case may just be exceeding the thermal capacity of the adhesive.