96 COE Glass
Spectrum 96 COE Glass, or System 96 is the most common brand, although Uroboros also makes a 96 COE. The main complaint about 96 COE is that it is limited, especially compared to Bullseye.
Spectrum 96 COE is thinner than Bullseye 90 COE glass. It is about 12.5% thinner. So, you will end up using more glass in the long run by using a thinner glass. Remember glass wants to obtain a ¼” thickness, and this can affect your projects.
When glass fusing, there is a wider range of temperatures between the not quite fused and the fully fused phase. So, consider this when using 96 COE. Keep accurate notes for future firings. Supposedly this range gives you a greater freedom in forming and a wider margin of error in your fusing process.
Much of Spectrum's 96 will fire different depending on which way it is fired, upside or down-side. This can cause some problems in fusing. There is no disclaimer on their website or by the dealers who sell it. It is important to mark which side of this glass is up. Many individuals put a mark or sticky on the upside of their piece to keep track of the correct side. This tends to be a real hassle.
Spectrum still suggests that you test their glass for compatibility. They claim that testing is your best teacher, and you might just uncover a set of circumstances in which their product doesn’t work in your system of variables.
It is told that 96 COE glass will not devit. Supposedly the ingredients for 96 COE glass is different that the recipe for 90 COE glass. This different processing is said to prevent 96 COE glass from devitrification.
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