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1916-2016

The Influence of Boric Oxide on the Annealing Temperature of Borosilicate Glasses JSGT_V07_T073-T076

The Influence of Boric Oxide on the Annealing Temperature of Borosilicate Glasses JSGT_V07_T073-T076

Attention has already been directed in the preceding paper to the fact that maximum hardness as tested by resistance to cutting with a file, occurs in the glasses with 20% sodium oxide at the point near to which the maximum annealing temperature is found. The glass of the 10% sodium oxide series which was found to be hardest when worked in the blowpipe was that with the highest annealing temperature. This connection is to be expected in' view of the relation between annealing temperature and viscosity.

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