The use of glass in the hot extrusion of metals

GT V02 1961 199-200

One of the characteristics of glass, its viscosity at high temperature, allows its use as a lubricant in the hot forming of metals. The application of this property to piercing and extrusion of metals is a French invention well known as the ' Ugine-Sejournet Process'. While, for the extrusion of most steels, ordinary window glass is suitable, ,for the extrusion of non-ferrous metals special glasses are required. Although a number of trials, made with a view to applying this technique to non-ferrous metals, have been encouraging, the process has not so far been developed in this field, owing to the lack of glasses well adapted to the low temperatures used. The glass characteristics which are sought are: viscosity from 1000 to 10,000 poises at approximately 350, 400, 450, 500" C (four glasses); no lead content; if possible, soluble in water.

J. Bufet & A. Collinet
Compagnie du Filage des Me'taux et des Joints Curty, 30 Avenue de Messine, Paris