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Old 05-01-2018, 03:25 PM
Jordan Kube Jordan Kube is offline
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Join Date: Aug 2003
Location: Seattle, WA
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Using Dave's calculator I would shoot for 91 LEC for something compatible with Cristalica. My notes indicate the more phosphate you add the lower your target number will be. I melted a 5% that showed 1 point high in a trident seal but no stress showed in the product under the polarimeter. The calculator shows a theoretical 87.75 LEC. Melting a phosphate opal will yield different results than a straight soda lime calcedonia. You can really only rely on your previous phosphate tests as a guide.
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