The Influence of the Addition of Small Quantities of Alkaline Salts on the Ease of Melting and on the Working Properties of Soda–Lime–Silica Glasses prepared from Cullet.

JSGT 1929 V13 T047-T056

 After a survey of the results recorded, we are of the opinion that the most effective salt in producing easy melting and refining, combined with good working properties and least extensive corrosion, is sodium carbonate. Next in order comes borax. All the salts, however, led to very surprising results as compared with glasses prepared either entirely from cullet or from a mixture of cullet with 50% or less of batch. From our observations, indeed, it appeared that all the glasses prepared from cullet with small additions of sodium carbonate, borax, or saltcake mixed with carbon became plain before any glass prepared from a mixture of batch with cullet. This result, in itself, is not only striking, but is also important, both from the practical and the theoretical point of view.

F. W. Hodkin, W. E. S. Turner & F. Winks