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The volatilisation of boron introduced by the addition of Borax, from glass at temperatures of 1100 C and above is substantial due to its vapor pressure.
As an example in E-glass 10 – 25% boron loss is calculated, water vapor has significant impact on the evaporation of boron.
Boron volatiles condensate between 400 – 800 C and form all sorts of borates along the way playing havoc with alumna silicate refractory.
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