Hello Glassies,
Honestly, I have graduated from most crack and bubble questions, but this one I haven't seen. I have a textured fused piece which has been fired 3 times I believe and yesterday I sandblasted it. I wanted to fire to 1150 ala Tony Smith, but I see a small 1/2" crack in the platter just off the center which I can't explain. The glass varies in thickness due to texture and build up of glass pieces but is never thicker than 3/8" or so. The little fissure is in a thick area. Could I fire higher to mend the fissure but loose my sandblast? Can I fire to 1150 and live with the crack? Is the piece doomed?
Any and all advice gratefully received.
Leslie
1/2" crack in middled of 16" platter
Moderators: Brad Walker, Tony Smith
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1/2" crack in middled of 16" platter
Leslie Ihde
Turning Point Studio
Vestal, New York
Turning Point Studio
Vestal, New York
Leslie,
The piece is salvageable. To heal the crack you will need to go up to at least 1400°F. If there the check goes through he thicker section as indicated I suspect you did not anneal log enough. When you reheat take it up very slowly (as slow as possible) to minimize the crack from spreading, and when you anneal gauge the time based on the thickest section. I don’t think it is possible to save the sand blasting you did. I don’ think you will be able to get away with just going up to the annealing temperature. As long as the crack is there and not healed it will have a possibility of lengthening anytime it experiences a temperature change.
Tim
The piece is salvageable. To heal the crack you will need to go up to at least 1400°F. If there the check goes through he thicker section as indicated I suspect you did not anneal log enough. When you reheat take it up very slowly (as slow as possible) to minimize the crack from spreading, and when you anneal gauge the time based on the thickest section. I don’t think it is possible to save the sand blasting you did. I don’ think you will be able to get away with just going up to the annealing temperature. As long as the crack is there and not healed it will have a possibility of lengthening anytime it experiences a temperature change.
Tim
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- Posts: 45
- Joined: Wed Jun 04, 2003 9:02 pm
- Location: Vestal, New York