Bullseye glass shrinkage after fusing
Posted: Mon Nov 27, 2017 7:26 am
Hello, looking for some tips on how to anticipate fuse shrinkage while fusing Bullseye glass. All thoughts/comments welcome!
I'm getting ready to make 2 fused pieces. The final sizes of the pieces must be 48,1 x 33 cm (18.9 x 13 inches) and 58,1 x 32,9 cm (22.9 x 13 inches), give or take a smidge. These fused panels will fit into windows in an apartment interior, in the bathroom door and the bedroom door.
The basis glass sheet is 3 mm thick and then there will be design-flowers built up on that but not overall on the glass. Some of the final piece will be 3mm thick, in some places 5-6 mm thick. I intend to leave the edges of the glass free of materials so that there's not an issue with placement.
I've done some small tests in advance to see how I want to make the design and at what temperature. The final pieces will be fired at 785 C.
Of the two tests I've done at 785 C:
- for the first test the glass size pre-firing was 18,2 x 16,7 cm and the size post-firing was 18 x 16,5 cm
- for the second test the glass size pre-firing was 18,3 x 14,4 cm and the size post-firing was 18 x 14,2 cm
Is there any way I can reliably scale up the sizes so that I get just the right amount of shrinkage ?
Thanks in advance!
kind regards,
Lisa
I'm getting ready to make 2 fused pieces. The final sizes of the pieces must be 48,1 x 33 cm (18.9 x 13 inches) and 58,1 x 32,9 cm (22.9 x 13 inches), give or take a smidge. These fused panels will fit into windows in an apartment interior, in the bathroom door and the bedroom door.
The basis glass sheet is 3 mm thick and then there will be design-flowers built up on that but not overall on the glass. Some of the final piece will be 3mm thick, in some places 5-6 mm thick. I intend to leave the edges of the glass free of materials so that there's not an issue with placement.
I've done some small tests in advance to see how I want to make the design and at what temperature. The final pieces will be fired at 785 C.
Of the two tests I've done at 785 C:
- for the first test the glass size pre-firing was 18,2 x 16,7 cm and the size post-firing was 18 x 16,5 cm
- for the second test the glass size pre-firing was 18,3 x 14,4 cm and the size post-firing was 18 x 14,2 cm
Is there any way I can reliably scale up the sizes so that I get just the right amount of shrinkage ?
Thanks in advance!
kind regards,
Lisa