Boron (B2O3) is a low temperature glass former.  It has a lower melting temperature than Silica.

Boron isn’t technically a flux, although it’s often referred to as one. While it does bring down the melting temperature of silica, it’s considered a glass former because it will melt into a glass all on its own.

Boron is required to make durable glazes at temperatures below cone 10.

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