A bstract Data are presented on the properties of twenty‐seven Na 2 OSrO. Al 2 O 3 .SiO 2 glasses covering the following percentage composition ranges: SiO 2 66 to 78; SrO 4 to 16; Al 2 O 3 0,2, and 4; and Na 2 O 14, 15.5, and 17. The effects of the systematic substitution of SrO for SiO 2 , A1 2 O 3 , and Na 2 O are shown for liquidus temperature, viscosity, coefficient of expansion, deformation temperature, density, and resistance to dilute acid and distilled water. Comparisons are shown between these SrO glasses and corresponding CaO glasses for those properties previously described.
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