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·Page 14 ·Back Cover
P  Y  R  E  X


THE INTRODUCTION OF PYREX insulators in 1923 marked the start of a new era in power transmission. Here was pioneering. Here was improved insulation due for the first time to a new material; glass, to be sure, but so different from ordinary glass as to require a new concept of this versatile material.

    The problem of melting this new glass was not unlike devising a container for a universal solvent. Its resistance to heat is higher, its coefficient of expansion lower than any other ceramic substance save fused quartz--and the heat required to melt it quickly destroyed existing types of tanks in which glass is melted.

    The laboratories of Corning Glass Works, leading technical glass manufacturer for sixty years, were assigned this initial problem to solve. As a result a new type of tank was developed which was able to withstand the new high temperatures satisfactorily.

    The moulding of these insulators also presented difficult problems, for when the glass is melted it must be poured into a mould and pressed quickly into its final shape, before it cools and hardens. Step by step new or improved processes were developed by Corning laboratories for manufacturing, annealing, and testing PYREX insulators to provide more efficient insulation than the industry has been able to obtain before.