Thread: Ferro frit
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Old 12-10-2017, 02:20 PM
Nick Delmatto Nick Delmatto is offline
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Jim, regarding Ferro Frit, I generally melted approx. 66% cullet, 33% Ferro Frit, & small amounts of silica & or borax. The cullet is factory cullet with a COE 89. I don't know if Ferro designed this frit to fit this cullet. I got both from a factory that went out of business in 2007. I do pull thread tests along with color encased paperweights that I check with polarizing filters for compatibility. This blue is 5.3% CuO (copper oxide) & .43% Co3O4 (cobalt oxide). It works for threading also. I also have black-purple, green & pink Ferro Frit. It works like a normal glass. I hope this answers your question. I've never posted a jpg here before, I hope it shows up.
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