How could I have prevented these bubbles?

[Shelley Lewis]

This was a two layer full fuse with a little frit on top. 96 Coe, 11inches in diameter. I used the following firing schedule:
200 1150 45
200 1250 45
Full 1460 12
Full 960 1.15
150 700 0

I normally like bubbles in glass, but for this project I was hoping to avoid them. Thanks for your input!

[Al Bray]

One way is with the application of a very light layer of clear powder between the two layers.

It's discussed here.

http://www.bullseyeglass.com/images/sto ... _power.pdf

You mentioned your using 96, but the concept in this document is the same. You just might want to stick with the top full fuse temp of 1460 as you have in your original schedule.

- Al

[Shelley Lewis]

Thanks Al! Will give it a whirl.

[JestersBaubles]

This was a two layer full fuse with a little frit on top. 96 Coe, 11inches in diameter. I used the following firing schedule:
200 1150 45
200 1250 45
Full 1460 12
Full 960 1.15
150 700 0

I normally like bubbles in glass, but for this project I was hoping to avoid them. Thanks for your input!

Slower ramp up from your 1150 to 1250, and hold a little longer. I usually ramp "normally" to 1100, 50 deg F/hour up to 1250, hold for an hour, then ramp to process temp.

It's darned near impossible to remove all bubbles, but this is a pretty good bubble squeeze.
Dana w.

[Shelley Lewis]

Thanks, I'll give this a try too!

[Laurie Spray]

If you want absolutely no bubbles in a piece prefire your base with out the edge design. It will weight it down just enough to trap some air. It does take an extra firing but can be worth it. I can fire a 24" round of 96 with the schedule Dana suggested......going 50 degrees an hour from 1100 to 1250 with a hold at 1250...... And end up with a double piece of glass that looks like one. Totally no bubbles.

[Shelley Lewis]

Thanks for the tips everyone! Don't know what I'd do without this newbie forum!

[Drewcilla]

I, too, thank you. I really appreciate the advice I get from this site.