SURFACE TENSION OF GLASS AND ITS EFFECT ON CORDS*

The results of experiments with synthetic cords indicate that surface tension is the most important factor in the disappearance of cords. The viscosity relations of the glasses do not correlate with the tendency to form inhomogeneities. Fibers of higher surface tension than the base glass with which it is fused form cords, and those of lower surface tension do not. Compositions that are high in RO or A1208 tend to form inhomogeneities in glasses which have a lower content of these two constituents.