Density Factors for Soda‐lime Glasses 1

Density factors based on oxides are criticized. A series of glasses are analyzed, compositions calculated in terms of Na 2 O·2SiO 2 , CaO·SiO 2 , MgO·SiO 2 , SiO 2 , and Al 2 O 3 . Factors for the three assumed compounds are calculated from three of the glasses, factors for SiO 2 and Al 2 O 3 as given by other investigators adopted, and the factors applied to the calculation of densities for the series of glasses. The results show close agreement with measured densities for six glasses analyzed and one described in the literature.