Abstract: A composition and process for producing a foamed glass molded product, the process employing a composition which is a mixture of one part by weight of a finely ground glass containing more than 25 weight % alkali metal oxide; from 21 to 400 parts by weight of a finely ground glass containing less than 16 weight % alkali metal oxide; water present in a water to solids weight ratio ranging from 1:1.4 to 1:3.0; and a foaming agent. The combined ingredients are heated to release gasses from the foaming agent and thereby foam the glass. The foamed glass moldings may be granules or cast shapes.

Abstract: Method for making shaped foam glass bodies from ground glass by hydrolysis in a hydrolysis mixture with solid alkali silicate and water, in which at least one foaming agent is added to the hydrolysis mixture, or to a resulting slip to form a foam producing mass, and in which the foam producing mass is foamed at an increased temperature. A mixture of two types of glass, namely (a) glass containing more than 16% by weight alkali oxide, and (b) glass containing less than 16% by weight alkali oxide, 95% of each having a grain size of less than 0.1 mm, at a weight ratio of a:b=1.1.5 to 1:20 is mixed with water at temperatures from 50.degree. to 100.degree. C. until the mixture thickens, the ratio of water to total solids being 1:1.4 to 2.5. The resulting mass into shaped foam glass bodies.