Is all float glass compatible?
Most of the commercially available float glasses are fairly similar to one another. The COE of any given float glass will depend on which plant it came from, and who tests it (which is typically not the glass manufacturer). Some glass distributors call float glass 82 COE, others call it 85 COE, and still others call it 88 COE. I have tested glasses labeled all three of the above COEs, against the standard that I use, and found them all to be compatible. In another circumstance, I have also tested two samples that were both marked the same COE, and found them to be incompatible with each other. Always test all of the glass against a known quantity before embarking on a major fusing project. For more information on testing compatibility and COE see Kiln Firing Glass: Glass Fusing Book One, by Boyce Lundstrom.
