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Title:
ULTRAVIOLET ABSORBING COLORED GLASS
Document Type and Number:
Japanese Patent JPH07138043
Kind Code:
A
Abstract:

PURPOSE: To obtain glass having characteristics capable of absorbing ultraviolet rays and sufficiently transmitting visible light and having color tone not discoloring by the ultraviolet rays.

CONSTITUTION: This colored glass for building and vehicle consists of 65-75wt.% of SiO2, 0.1-5.0wt.% of Al2O3, 10-18wt.% of Na2O, 0-5wt.% of K2O, 5-15wt.% of CaO, 1-6wt.% of MgO, 0.05-1.0wt.% of SO3, 0.10-0.18wt.% of vanadium expressed in terms of V2O5, 0.4-0.6wt.% of MnO2, 0-0.0015wt.% of CoO and 0.08-0.16wt.% of iron expressed in terms of Fe2O3. In the colored glass, 0-10wt.% of total iron content is FeO and when main wavelength by measured light C is 574-581nm and the color purity is 4-6% and the glass has 3-5mm thickness, visible light transmittance of measured light A is ≥70%. The colored glass is obtained by melting a batch obtained by compounding silica, feldspar, dolomite, soda ash, manganese oxide, iron (II) oxide, vanadium pentoxide, cobalt oxide as raw materials under the atmosphere of a chamber kiln (in about 2% O2 concentration) so as to give a prescribed composition.


Inventors:
ITOU MIZUKI
KIJIMA SHUN
Application Number:
JP28330193A
Publication Date:
May 30, 1995
Filing Date:
November 12, 1993
Export Citation:
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Assignee:
ASAHI GLASS CO LTD
International Classes:
C03C3/087; C03C4/02; C03C4/08; (IPC1-7): C03C4/08; C03C3/087; C03C4/02
Attorney, Agent or Firm:
Kenji Izumina