Assertion: borax's boron | /r/CapableOf | decrease melting temperature of silica
Facets:
Source sentences:
text: The boron is present as borosilicate, borax, or boron oxide, and is added to increase the strength of the glass, or as a fluxing agent to decrease the melting temperature of silica, which is too high to be easily worked in its pure form to make glass fibers.