Help on a tac please

[Laurie Spray]

I should know this and need an answer if possible tonight


8 stacks of bullseye tac fuses with no distortion at 1300 with a 10 min hold
Glass stuck together without changes in the edges

Spectrum 96 site says tac fuse is 1350....... Sounds high to me

The stack is 24" by 1" tall and for this I do not want to use a dam

Help please!!!

[JestersBaubles]

I should know this and need an answer if possible tonight


8 stacks of bullseye tac fuses with no distortion at 1300 with a 10 min hold
Glass stuck together without changes in the edges

Spectrum 96 site says tac fuse is 1350....... Sounds high to me

The stack is 24" by 1" tall and for this I do not want to use a dam

Help please!!!

I find 1350 to be the upper range -- in my kiln 1350 will round out the edges. The glass will start "sticking" together anywhere after about 1250. I think you would be OK at 1300 with S96, as well, but it would be good to do a test . Maybe check out two layers quickly if you have a small kiln (of course, that doesn't tell you how it's going to behave in the larger kiln...).

Dana W.

[Laurie Spray]

thanks Dana

[Bert Weiss]

You are looking for an effect of heat work. Different kilns with different loads will make their heat work differently. You can never just go by some posted temperature. You have to observe and go by your observations.

I learned about this with a radical situation. Before I built my big kiln, I rented time in a car kiln, large enough to walk in. The kiln was all brick. Firing 20mm glass to 1400 in that kiln created much more heatwork than 1480 in my fiber kiln. The catch to this situation is that temperature does matter. But, in some kilns to get to a particular temperature, you have to put the glass through more heat work than in others. In my fiber kilns, I have way more control than in brick kilns.