Hoping someone can help me with my issue; I'm at the end of ideas to try!
I have been trying utilize a tile saw to create more regularly-sized pieces for my jewelry designs. The process:
- Bullseye 90CoE glass strips fused for 10 min @ 1425 in Skutt kiln. No devit issues.
- These strips are then cut on an MK101 tile saw using a Husqvarna Superlok Glass blade.
- After scrubbing with toothbrush and clean towel they are fused again for 15 min @ 1425 for desired roundness and gloss.
Unfortunately, the cut edges have a grey hazy 'scar' that seems be sealed into/under the fire gloss.
I thought this might be devit, but no other surfaces show any issues / contamination, and the 'scar' is glassed over, not on the surface. Glass pieces that are snap-cut rather than ground/saw-cut and fired in the same batch are absolutely perfect with no devit, so I have ruled out kiln contamination.
I have tried a number of different things to get rid of this:
- Grind all cut edges with a wet grinder, clean with ISO. No difference.
- Wet-sand all cut edges with Covington wet sander / silicon paper, clean with ISO. No difference.
- Wet-sand with progressively finer sand paper up to 600 grit, clean with ISO. No difference.
- Difference firing schedules, including a hold at fire-gloss temp, then raise to 1425 for final. No difference.
I'm at wit's end!