British Supplies of Potash-felspar, Considered from the Glass-making Point of View

JSGT 1918 V02 T035-T071 (39 pages including 2 of plates)

Potash-felspar has three chief uses in industry. In the manufacture of certain kinds of glass it is of considerable value as a source of both potassium and aluminium. Its use in this connection is dealt with more fully hereafter. The mineral is used in the pottery industries principally in the making of glaze, but also in the body of such ware as that used for electric insulators, where compactness and some desire of vitrification are required. In glazes the use of potash is preferred to that of soda, on account of the former being less liable to crystallise.

P. G. H. Boswell