Bubble trouble

[Michael Harmon]

I am consistently getting large bubbles when I do simple two layer pieces? I place a large solid piece on bottom with smaller elements on top. My schedule;

400 1225 20
600 1480 60
AFAP 900 60
100 700 0

Any suggestions would be greatly appreciated.

[Michael Harmon]

I tried to post a picture but I get an error message that says the file is too big.

[Marty]

Slow down on the way up. Try 300dph, or 250.
You're spending too much time at the top (at that temp).
Do some experiments- see what happens with 15 minutes at 1480, or 30 at 1460, etc. You'll have to find the right combo for your kiln/glass set up.

[JestersBaubles]

are you capping with clear?

If so, Longer bubble squeeze.

Dana

[Michael Harmon]

Thanks Marty, I suspected that so I appreciate your confirmation. The piece just looked like it had gotten too hot. What do you think about this schedule;

400 1225 60
275 1460 10
AFAP 900 60
100 700 0

[Valerie Adams]

Is your lay up two full layers of glass? By that I mean, are the smaller pieces on top fitted together, or do you have areas of glass that is only one layer thick in places? That can cause bubbles.