Obtaining salt brine from this depth was a pioneering develop­m e n t whicEa presented numerous problems. A l l have been solved to assure successful operations.

Chlorine and Caustic Soda from the ivorld's deepest salt ivetts

The deepest salt bed in commercial use—6,800 feet below the earth's surface—provides the brine used at Columbia's electrolytic chlorine-caustic soda plant at Natrium, West Virginia. Hot water, pumped down to this great stratum, dissolves the rock salt and forces the brine to the surface.

The favorable location of the Natrium plant was established as a result of pre-Pearl Harbor studies by Columbia. Built and operated for the DPC, its post-war purchase by

Columbia assured continued opera­tion so helpful in meeting the urgent needs of industry for caustic and chlorine. The caustic soda is purified by a patented Columbia process to meet exacting uses such as required in the manufacture of rayon.

Pittsburgh Plate Glass Company, Columbia Chemical Division, Pitts­burgh 13, Pa. Distr ict Offices: Chicago, Boston, St. Louis, Pitts­burgh, New York, Cincinnati, Cleve­land, Minneapolis, Philadelphie, Charlotte, San Francisco.

C O L U M B I A C H E M I C A L S

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