Fifty years of glass making : 1869-1919 by Macbeth-Evans Glass Company Pittsburgh Pa

Author:Macbeth-Evans Glass Company, Pittsburgh, Pa
Language: eng
Format: epub, pdf
Tags: Glass manufacture
Publisher: Pittsburgh : Macbeth-Evans Glass company
Published: 1920-03-25T05:00:00+00:00

and for that reason is used only in those glasses where high brilliancy is required.

Nitre and borax are alkalies which are frequently used because of the large amount of oxygen which they contain. Glass in which alkalies have been used to excess, when exposed to the chemical action of the atmosphere and moisture, takes on an iridescent appearance, and in many cases this "soft glass" if stored away for a time will have its entire surface covered by a white film.

Lead is the principal metallic ingredient and is used either in the form of litharge or red lead. Lead increases the brilliancy of glass and makes it heat resistant.

Aluminum, arsenic, zinc, tin, barium, antimony and many of the rarer elements are now used in glasses manufactured to meet special requirements.

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