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1916-2016

The Function of Arsenic in Soda-Lime-Silica Glasses. Part I JSGT_V10_T003-T019

The Function of Arsenic in Soda-Lime-Silica Glasses. Part I JSGT_V10_T003-T019

It would appear that arsenious oxide is not all expelled during the process of glassmaking, and that a considerable proportion of it may be converted to the higher form, namely, arsenic oxide. In such case it is not clear how the material can be of very great value as a refining agent when added to the batch at the outset, whatever may be the action when a lump is added towards the end of the founding operation. More readily recognisable advantages are its function in counterbalancing excess of selenium or manganese dioxide and its scavenging action in removing carbonaceous matter, although it would be an expensive method of carrying out the latter operation if this were its only function. It has also been stated to increase the crushing strength of glass, whilst it is not infrequently referred to as possessing a decolorising action of its own.

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