Note on the Solubility of Clay in Glass
T280-T284 (5 pages)
The fact that clay is soluble in glass is quite well known. Not only is it the common experience that roof dropping, chips from fireclay brick or pieces of pot are gradually absorbed by the metal into which they fall but it is also the practice both on the Continent and in this country, to add clay to the, batch, resulting actually in the addition of alumina with its valuable properties to the glass. The clay may be added in various forms. For dark bottle glass, ground brick or tile is frequently employed, whilst less frequently raw clay is used. For pot metal, alumina may also be added conveniently as china clay. Naturally, in all such cases, the clay is added in a finely divided state.
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