I have been buying .187" black extruded acrylic from my local Professional Plastics warehouse for years, but they have changed suppliers or something, but I can no longer use the stuff they stock and the local guy doesn't seem to be able help me.
The problem is the film mask. The newer stuff is thicker and darker blue than the product I was using. I cut small parts with my 40W ULS and the dark blue mask is very difficult to peal because the laser either welds it to the acrylic or the lip formed with the heat prevents lifting the edge of the mask.
So, I'm looking for a supplier of acrylic sheet with the thin light-blue film mask. The thick stuff takes too much time to remove and it doesn't give as nice a cut either. The flame polished surface looks like it has small sand particles embedded in it. I'm guessing that's residue from the thick mask.
Does anyone know what brand acrylic comes with the thin mask? Any recommendation for a supplier in the Portland, Oregon area?
Thanks!