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The surface tension of 154 compositions in the system BaO-B,Os-Si02 were mea sured by a maximum pull-on-cylinder method, over the approximate range 900° to 1,300° C. The region of glass formation was investigated along with the adjacent regions. Several compositions were studied in the two-immiscible-liquid region. In this two-liquid region the lines of constant surface tension followed the tie lines in the phase diagram. Outside the twoliquid region the surface tension was increased by the addition of BaO and to a lesser degree by Si02• At 900° C the surface tension was relatively high near the composition corresponding to the 3BaO·3B20 3·2Si02 compound, which has a melting point of ] ,009° C.

Surface tension of molten glasses in the system barium oxide-boric oxide-silica