Abstract: Boron-free and fluorine-free glass compositions are provided that have properties of liquidus temperature, softening point and tensile strength similar to those of "E" or "621" glass compositions. These boron-free glass compositions have in percent by weight the following components:______________________________________ SiO.sub.2 55-61 Al.sub.2 O.sub.3 12-18 MgO 4-10 CaO 14-18 Na.sub.2 O 0.1-1.5 Li.sub.2 O 0.1-1.5 BaO 0.0-1.0 ______________________________________The compositions may also have minor amounts of Fe.sub.2 O.sub.3, TiO.sub.2, and K.sub.2 O. The glass compositions may be only boron-free and may have a minor amount of fluorine.