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1916-2016

The effect of small additions of sodium sulphate on the refining of glass GT_V3_1_135-144

The effect of small additions of sodium sulphate on the refining of glass GT_V3_1_135-144

The effect of varying the time of melting of a soda-lime-silica glass between 3 and 4 h, and of the addition of sodium sulphate up to 20 parts per 1000 of sand, has been investigated at a temperature of 1420°C with a controlled melting atmosphere. The results show that additions of 7½-20 parts Na2SO4 per 1000 sand markedly improve the refining of the melt. These results are in agreement with those of other authors but the technique has enabled a coefficient of variation of 10% to be obtained. The results also suggest that low levels of sulphate, in the absence of other refining agents, may have a detrimental effect, and it will be important to study this aspect more closely.

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