Process for producing a glass article protected from coloring by

Details Process for producing a glass article protected from coloring by Process for producing a glass article protected from coloring by

1989-07-24

1991-10-15

Kratz, Peter

Glass manufacturing

Processes

With chemically reactive treatment of glass preform

65 3014, C03C 2100

Patent

active

050571346

ABSTRACT:
A process for producing a glass article protected from coloring by electron rays comprises preparing a soda-lime-silica glass, contacting the glass with a molten salt containing potassium ions so that sodium ions in a surface layer thereof are exchanged by potassium ions, and subjecting the glass to heat treatment so that the surface layer thereof in a depth to which the irradiated electron rays penetrate when electron rays are irradiated has a composition defined by a molar ratio of 0.4 to 0.65 for Na.sub.2 O/(Na.sub.2 O+K.sub.2 O). The soda-lime-silica glass is composed of 50-75% by weight of SiO.sub.2, 0.5-2.5% by weight of Al.sub.2 O.sub.3, 0-0.1% by weight of Fe.sub.2 O.sub.3, 5.0-14.0% by weight of CaO, 0-4.5% by weight of MgO, 5.0-16.0% by weight of Na.sub.2 O, 0-2.0% by weight of K.sub.2 O, 0-0.5% by weight of TiO.sub.2, and 0-0.5% by weight of SO.sub.3. The content of alkali metal oxides in the glass is 5% and above, and ratio of Na.sub.2 O in the alkali metal oxides is 65% and above.

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