Rods and Tubes COE 33 (Boro)
Borosilicate glass is not compatible with so-called "Soft Glass" or "Moretti Glass". Boro glass has a COE (Coefficient Of Expansion) of 33 x 10-7. "Soft" or "Moretti" glass has a COE of 104 x 10-7. Because of the large difference between COE 33 and COE 104, these two types of glass are definately not compatible with each other. None the less, we love them both!
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