glass shrinkage

Luiza · Post by **Luiza** » Wed Jun 25, 2003 9:25 pm

Hi
I have to fuse one layer of glass - 3mm. I know that there will be some shrinkage. I want that the final piece to be 8.3X7.5 in. Is there any formula that I can use to calculate the size of the original glass? Is it linear, or the shrinkade depends upon the area?
Thanks
Luiza

Bert Weiss · Post by **Bert Weiss** » Wed Jun 25, 2003 9:27 pm

Luiza wrote:Hi
I have to fuse one layer of glass - 3mm. I know that there will be some shrinkage. I want that the final piece to be 8.3X7.5 in. Is there any formula that I can use to calculate the size of the original glass? Is it linear, or the shrinkade depends upon the area?
Thanks
Luiza

Test

Brock · Post by **Brock** » Wed Jun 25, 2003 9:42 pm

Luiza wrote:Hi
I have to fuse one layer of glass - 3mm. I know that there will be some shrinkage. I want that the final piece to be 8.3X7.5 in. Is there any formula that I can use to calculate the size of the original glass? Is it linear, or the shrinkade depends upon the area?
Thanks
Luiza

What do you mean, "fuse one layer of glass "? You should be able to fire polish a pices of glass that size without it trying to achieve equilibrium thickness. Brock

Luiza · Post by **Luiza** » Wed Jun 25, 2003 9:53 pm

Well, I wonÂ´t really fuse it, but I want to texturize it with some forms done from fiber paper, and IÂ´ve done lots of tests and I found that it has to stay 10 min soak at 1470 F, to be perfect.
Thanks
Luiza

Brock · Post by **Brock** » Wed Jun 25, 2003 9:57 pm

Okay. See Bert's post. Brock

Luiza · Post by **Luiza** » Wed Jun 25, 2003 10:01 pm

ThatÂ´s not fair

At least it is linear???? If I test one I can apply for any areas????
Please, say YES
Luiza

Brock · Post by **Brock** » Wed Jun 25, 2003 10:08 pm

I don't know. The longer you're hot the more it'll pull in. Why can't you make it out of 6 mil glass? The tiles look better. Brock

Luiza · Post by **Luiza** » Wed Jun 25, 2003 10:24 pm

ItÂ´s not a tile. IÂ´m doing 18 pieces of glass to decorate a bathroom door, and the idea is to have diferent textures. So I decided to texturize one layer, and IÂ´ll put it together with another blasted or "sponge painted", so that it has a good appearance from both sides, and will not be transparent.(Some privacy...). They will be at a door of a bathroom of a person that bought my first sink. IÂ´m so proud!!!!!! And IÂ´m also so gratefull to Bert and Carol. Good friends, both of you...
ThatÂ´s why I canÂ´t use 2 layers. Any idea to make things easier?
Luiza

Brock · Post by **Brock** » Wed Jun 25, 2003 10:29 pm

Luiza wrote:ItÂ´s not a tile. IÂ´m doing 18 pieces of glass to decorate a bathroom door, and the idea is to have diferent textures. So I decided to texturize one layer, and IÂ´ll put it together with another blasted or "sponge painted", so that it has a good appearance from both sides, and will not be transparent.(Some privacy...). They will be at a door of a bathroom of a person that bought my first sink. IÂ´m so poud!!!!!! And IÂ´m also so gratefull to Bert and Carol. Good friends, both of you...
ThatÂ´s why I canÂ´t use 2 layers. Any idea to make things easier?
Luiza

Are these going into a matrix, lead, or wooden mullions? How are the two tiles being assembled? Do you have access to a tile saw or a wet belt sander? Brock

Luiza · Post by **Luiza** » Wed Jun 25, 2003 10:37 pm

ItÂ´s a wooden door, six lines with three columns of glass.
I have a sander, but not a wet one, and no, I donÂ´t have a tile saw. It was a long discussion, the tile saws here are 11000rpm...
I was thinking that I could glue the two tiles with UV glue...Good idea?
Luiza

Brock · Post by **Brock** » Wed Jun 25, 2003 10:45 pm

I'd go with GE silicone, the UV glues require a very smooth fit between the layers. Silicone is much more forgiving. You could also use the silicone as the bedding compound in the mullions. Now, as to the size.

Test.

Brock

Luiza · Post by **Luiza** » Wed Jun 25, 2003 10:47 pm

Thanks a lot. Silicone will be much better!!!!!!
Ok, ok, IÂ´ll do the tests

Luiza

Luiza · Post by **Luiza** » Wed Jun 25, 2003 11:04 pm

Brock
What would you suggest if I had a wet belt sander and a tile saw????
Luiza

Brock · Post by **Brock** » Thu Jun 26, 2003 2:01 am

Luiza wrote:Brock
What would you suggest if I had a wet belt sander and a tile saw????
Luiza

I wouldn't be worried about shrinkage, I'd make the tiles oversize and cut them down to the exact size you require. Brock

Luiza · Post by **Luiza** » Thu Jun 26, 2003 6:22 am

Brock wrote: I wouldn't be worried about shrinkage, I'd make the tiles oversize and cut them down to the exact size you require. Brock

I hate an obvious answer to a silly question.

I deserved it

Thanks for your help, Brock, IÂ´ll begining my test NOW.
Luiza

Bert Weiss · Post by **Bert Weiss** » Thu Jun 26, 2003 9:22 am

Luiza wrote:Well, I wonÂ´t really fuse it, but I want to texturize it with some forms done from fiber paper, and IÂ´ve done lots of tests and I found that it has to stay 10 min soak at 1470 F, to be perfect.
Thanks
Luiza

Luiza

I have done plenty of work around 1470 for 10 minutes. I now like 1365 for 1 hour. As long as devit is not an issue, this schedule yields a nicer surface on the bottom.

I guess that the size change will be different for various thicknesses. I find that the size doesn't change much for me. Sometimes not at all.

Luiza · Post by **Luiza** » Thu Jun 26, 2003 7:10 pm

Bert Weiss wrote:
Luiza

I have done plenty of work around 1470 for 10 minutes. I now like 1365 for 1 hour. As long as devit is not an issue, this schedule yields a nicer surface on the bottom.

I guess that the size change will be different for various thicknesses. I find that the size doesn't change much for me. Sometimes not at all.

IÂ´ve done some tests today, and I found that my 3mm layer - 21X19 cm -
was reduced to 20.3X18.2 cm. The worst are the edges - the layer is not a perfect rectangle anymore, it has 4 ugly edges.
IÂ´ll try 1365 for 1 hour tomorow.
Thanks
Luiza

Bert Weiss · Post by **Bert Weiss** » Fri Jun 27, 2003 12:41 am

Luiza wrote:
Bert Weiss wrote:
Luiza

I have done plenty of work around 1470 for 10 minutes. I now like 1365 for 1 hour. As long as devit is not an issue, this schedule yields a nicer surface on the bottom.

I guess that the size change will be different for various thicknesses. I find that the size doesn't change much for me. Sometimes not at all.
IÂ´ve done some tests today, and I found that my 3mm layer - 21X19 cm -
was reduced to 20.3X18.2 cm. The worst are the edges - the layer is not a perfect rectangle anymore, it has 4 ugly edges.
IÂ´ll try 1365 for 1 hour tomorow.
Thanks
Luiza

Luiza

It sounds to me like you have a few alternatives. You can make the piece 1-2" larger on all sides and cut it down with a glass cutter. You can try 6 mm glass or 10mm. Or maybe the lower temp will have a different effect.

It is interesting to me that you have the shrinkage problem. I guess that the factor of glass wanting to be 6mm holds close to true all around.

Luiza · Post by **Luiza** » Fri Jun 27, 2003 8:53 pm

Bert Weiss wrote: Luiza

It sounds to me like you have a few alternatives. You can make the piece 1-2" larger on all sides and cut it down with a glass cutter. You can try 6 mm glass or 10mm. Or maybe the lower temp will have a different effect.

It is interesting to me that you have the shrinkage problem. I guess that the factor of glass wanting to be 6mm holds close to true all around.

Hi Bert
I was thinking of making a test - let a 3mm layer stay for some hours at 1470 F - maybe it becomes a 6 mm layer

I canÂ´t use any glass thicker than 6 mm- that is the space I have -, and as I need 2 separeted layers, the thicker I can fire is 3 mm.
I tested the 1 hour 1365 F today. The kiln was still hot, so I couldÂ´n measure it. Now IÂ´ll have to wait till monday...
Unfortunately I donÂ´t have a tile saw, so IÂ´ll have to manage another solution.
I imagine that you donÂ´t have a faintest idea of how dificult is to work with glass or any other art or craft here. If some of you have interest I Â´ll be happy to make a "brief" of this wonderfull and absolutely non conventional country in SpabÂ´s place...There are very good things too - itÂ´s not bad at all

Thanks again
Luiza

Brock · Post by **Brock** » Fri Jun 27, 2003 9:24 pm

I'd love to hear your "brief" Luiza. Brock

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