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THE USE OF BORIC OXIDE IN GLASS‐MAKING
Author(s) -
TURNER W. E. S.
Publication year - 1924
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1924.tb18207.x
Subject(s) - borosilicate glass , boric acid , materials science , oxide , hydrochloric acid , annealing (glass) , thermal expansion , mineralogy , composite material , metallurgy , chemistry , organic chemistry
Boric oxide behaves differently from other glass‐making constituents in that the variation of physical properties is not progressively continuous with a variation in composition. With increase of boric oxide content in sodium borosilicate glasses, the refractive index (μ D ) rises to a maximum as also does the annealing temperature, while the coefficient of thermal expansion reaches a minimum and then rises. The durability, or resistance to water and hydrochloric acid reaches a maximum when the glass contains about 12% of boric oxide and subsequently falls off very rapidly. There is, accordingly, a limit to the usefulness of boric oxide in glass.