Abstract: The present invention relates to an unleaded durable transparent vitreous glass composition comprising a combination of(a) up to 98 wt % of a low alumina alkali borosilicate,(b) 2-20 wt % of a major addition of one element selected from the group of zirconium, tin and titanium, and(c) less than 10 wt % of at least one element selected from bismuth, barium, strontium, zinc, lanthanum, molybdenum, cerium and/or a fluoride containing inorganic compound wherein the amounts of (a), (b) and (c) are calculated on the basis of the total amount of the oxide forms of (a), (b) and (c),a process for its production and the use of said composition.