- May 9, 2010 at 11:56 pm #9422DeDaParticipant
Can you use clear window glass and clear picture glass as a base for projects?May 10, 2010 at 2:43 am #11627VernelleParticipant
Clear window glass is called float glass which has a COE of 82. It won’t mix with 90 or 96. (Bullseye or Spectrum)May 11, 2010 at 4:30 pm #11626
I just can’t help being pedantic here. The CoE of some float glasses is in the range of 82 +/- 3. So quite a big range. Also some is made in the region of 90. As the manufacturers do not care what the expansion is, there is no way of knowing exactly what a particular manufacturer is doing. Minor changes in the mix of materials will affect the coe and they just don’t care.
In any case, you are right that the float glass will not be compatible with any other glass, and often not with itself if it comes from an other batch or manufacturer.
Stephen RichardMay 11, 2010 at 6:45 pm #11625glassartguyParticipant
One of the assignments that I give the cadets at the National Guard Youth Challenge Academy at which I teach Glass Art and Careers is a clear glass fusing project. I cut a bunch of 8 x 6 (or so) sheets of float glass which is given to me by a local glass shop (yes! FREE). The art concept is LINE. They design, cut and glue pieces (Klyr-fire) of glass from the same piece that they use as the base glass. I then tack fuse the pieces. There is a glowing line on the edge of the pieces that have been fused onto the base glass. Those lines delineate the image. Some of the images are starlingly bueatiful. The cadets think the project is lame until they get the fused piece back, then they understand. Try it, you will be suprised at how easy and cool the pieces look.May 14, 2010 at 3:08 am #11624silverchakraParticipant
This sounds like a fun project to try. I have read on other glass sites that you can use float to fuse with other glass, but some posts here say no. If I’m understanding you correctly, you are using one piece of glass cut up (rather than mixing with different pieces of float) so that they will be the same coe, is that right? Anyway, I would like to try this. Thanks for sharing the idea!May 28, 2010 at 5:27 am #11628nenaviovicenteParticipant
I have read on other glass sites that you can use float to fuse with other glass, but some posts here say no.May 29, 2010 at 8:58 am #11629
You have to be concerned about compatibility. If you want to use glass from different manufacturers, you have to test the combination yourself. You will need to determine the annealing point(s) and observe them. You need to ensure that your annealing is adequate, so you can distinguish annealing from incompatibility stress. You will need polarised filters to determine what degree of stress is in the fired piece. This takes time. The manufacturer has already done it for you and this is reflected in the cost and ease of use.
It has been reported that float glass from different float manufacturers has proved incompatible. Certainly anything other than bottle glass and float glass will be incompatible, and most of the bottle glass prooves to be incompatible with float. Float is a relatively difficult glass to work with.
Stephen RichardMay 31, 2010 at 9:15 am #11630nenaviovicenteParticipant
If I’m understanding you correctly, you are using one piece of glass cut up (rather than mixing with different pieces of float) so that they will be the same coe, is that right?June 3, 2010 at 5:47 am #11631Vital-SparkParticipant
You can fuse float glass but one side is tinned. The tin is picked up because the glass “floats” on molten tin during manufacture. So once you identify the tinned side which will not fuse you can use it as described. Same as irid really it doesn’t fuse on irid side.June 3, 2010 at 6:23 am #11632
Well actually you can fuse float glass on the tin side. If you put the tin on the bottom of each of a two or more layer piece, you will have tin in contact with the air side and it does fuse. If you put tin to tin it will still fuse, but it is a very bad idea, as any further forming of the glass will show tin bloom.
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