TEMPERING GLASS
A new method of tempering glass, claimed to be revolutionary in the glass industry and offering a product much more elastic and tougher to mechanical shock and heat is described in a patent awarded to Charles J. Phillips, of New York. Glass customarily is tempered by heating and being plunged into molten fats, waxes, oils, or resins. But such tempering is too mild, asserts the inventor. On the other hand, water and molten metal tempering baths are too drastic, causing crack's and ruptures. The inventor finds that chemicals like sodium and potassium nitrates used in combination with calcium or lead nitrates will temper glass to the limit of its endurance, and reduce its capacity for rupturing.
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https://paperspast.natlib.govt.nz/newspapers/EP19390606.2.28
Bibliographic details
Evening Post, Volume CXXVII, Issue 131, 6 June 1939, Page 5
Word Count
118TEMPERING GLASS Evening Post, Volume CXXVII, Issue 131, 6 June 1939, Page 5
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