craters

[jocko]

I just can’t seem to get it right…. I have increased my bubble squeese at 1225f for 60 min. I have taken it to 1515 and held it 30min. I still get craters and bubbles and sometimes holes. am I holding to long @1515, is that too high, any help would be great. I use 96 COE

Thank you for your time

Mike

[Stephen Richard]

Some things that I can think of off hand that cause bubbles:

single layers

layup that is heavy on the egdes

no way out for the air

shelves with a dip

bubble squeeze at the wrong temperature – too low or high

If you give us some more information on configuration of kiln and of glass layup, schedules and all those other variables, we might be able to suggest some things.

Stephen Richard

blogs at: http://www.verrier-glass.blogspot.com/ and  http://www.glasstips.blogspot.com/

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