fused glass leaking under support ?
Posted: Tue Nov 13, 2012 10:02 am
Hello!
Thanks in advance for your answers!
We're fusing / casting BE glass into a self-made mold 23 x 90 cm (9 x 35 in) for eventual use in a lamp. A single piece of white BE was placed in each form, and then pieces of colored and transparent glass were artfully strewed over it. The side supports are a sort of ceraboard material that were held in place by a single layer of brick surrounding the outside. Two lamp pieces were placed in the oven at one time, with a piece of ceraboard material, approx. 1 inch thick, separated the two.
We leveled the oven and used a program that fired the glass at 830 C (1526 F) for 35 min - we were attempting to get an even layer of 7 mm throughout. That didn't quite happen, one side was 8-ish mm and the other side 6-7 mm, which is still oke.
But! The glass pushed the end support about 1/2 in out and seeped slightly under the support. We weren't expecting this kind of muscle from the glass -- any suggestions on how to prevent this on the next go-round? Some sort of sealant around the mold, material other than bricks?
Also - any thoughts on the flinging open of the oven once the 830 C / 1526 F step has been completed?
cheers, kind regards,
Lisa
Thanks in advance for your answers!
We're fusing / casting BE glass into a self-made mold 23 x 90 cm (9 x 35 in) for eventual use in a lamp. A single piece of white BE was placed in each form, and then pieces of colored and transparent glass were artfully strewed over it. The side supports are a sort of ceraboard material that were held in place by a single layer of brick surrounding the outside. Two lamp pieces were placed in the oven at one time, with a piece of ceraboard material, approx. 1 inch thick, separated the two.
We leveled the oven and used a program that fired the glass at 830 C (1526 F) for 35 min - we were attempting to get an even layer of 7 mm throughout. That didn't quite happen, one side was 8-ish mm and the other side 6-7 mm, which is still oke.
But! The glass pushed the end support about 1/2 in out and seeped slightly under the support. We weren't expecting this kind of muscle from the glass -- any suggestions on how to prevent this on the next go-round? Some sort of sealant around the mold, material other than bricks?
Also - any thoughts on the flinging open of the oven once the 830 C / 1526 F step has been completed?
cheers, kind regards,
Lisa