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Zeolite 'A', a hydrous sodium aluminosi/icate exhibiting molecular sieving properties, was synthesized at 75-120° from gels of various alkali and silica concentrations. The effects of parameters like gel composition, temperature and agitation of the starting gel have been discussed in brief, and the optimum conditions for complete conversion of a gel into Zeolite 'A' crystals have been suggested.

Several soda‐lime‐silica glasses were melted in which up to 8.52 wt% zinc oxide was substituted for calcium and magnesium oxide. Sonic Young's modulus and Charpy impact resistance measurements were made. The results indicated that an increase of 8.52 wt % zinc oxide reduced the Young's modulus by 9.0% and increased the impact resistance of the soda‐lime‐silica glass by 4.1%.

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