Grey glass composition
AssigneeGuardian Industries Corp.
InventorsScott V. Thomsen, Richard Hulme, Leonid Landa, Ksenia A. Landa
Life of this patent
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Abstract
A grey glass composition employing in its colorant portion at least iron (Fe2O3/FeO), cerium, cobalt and selenium is provided. The glass allows high visible transmission, and satisfactory IR and UV absorption, while at the same time achieving desired grey color. In certain example embodiments, the colorant portion includes, or may consist essentially of: total iron (expressed as Fe2O3): 0.25 to 0.70% cerium oxide: 0.01 to 1.0% selenium: 0.0001 to 0.05% cobalt oxide: 0.0001 to 0.05% titanium oxide: 0 to 1.0% glass redox: >=0.30.
Claims31
A grey glass comprising:
- a base glass portion comprising:
- Ingredient
- wt. %
- SiO2
- 67–75%
- Na2O
- 10–20%
- CaO
- 5–15%
- MgO
- 0–7%
- Al2O3
- 0–7%
- K2O
- 0–7%
- and a colorant portion consisting essentially of:
- total iron (expressed as Fe2O3)
- 0.25 to 0.70%
- cerium oxide
- 0.01 to 1.0%
- selenium
- 0.00001 to 0.05%
- cobalt oxide
- 0.0001 to 0.05%
- titanium oxide
- 0 to 1.0%
- wherein the grey glass has a redox value (FeO/Fe2O3) of at least 0.30, a visible transmittance (Lta) of at least 65%, a dominant wavelength in the range of from 435 nm to 570 nm, an excitation purity (Pe) of no greater than 5.0%, an IR transmittance (% IR) of no greater than 35%, a UV transmittance (% UV) of no greater than 40%, and a total solar transmittance (% TS) of no greater than 52%.
A grey glass comprising:
- a base glass portion comprising:
- Ingredient
- wt. %
- SiO2
- 67–75%
- Na2O
- 10–20%
- CaO
- 5–15%
- MgO
- 0–7%
- Al2O3
- 0–7%
- K2O
- 0–7%
- and a colorant portion comprising:
- total iron (expressed as Fe2O3)
- 0.25 to 0.70%
- cerium oxide
- 0.01 to 1.0%
- selenium
- 0.00001 to 0.05%
- cobalt oxide
- 0.0001 to 0.05%
- titanium oxide
- 0 to 1.0%
- wherein the grey glass has a redox value (FeO/Fe2O3) of at least 0.30, a visible transmittance (Lta) of at least 65%, a dominant wavelength in the range of from 435 nm to 570 nm, an excitation purity (Pe) of no greater than 5.0%, an IR transmittance (% IR) of no greater than 35%, a UV transmittance (% UV) of no greater than 40%, and a total solar transmittance (% TS) of no greater than 52%, and wherein the glass is substantially free of nickel.
Glass comprising:
- total iron (expressed as Fe2O3)
- 0.25 to 0.70%
- cerium oxide
- 0.01 to 1.0%
- selenium
- 0.00001 to 0.05%
- cobalt oxide
- 0.0001 to 0.05%
- titanium oxide
- 0 to 1.0%
- wherein the glass has a redox value (FeO/Fe2O3) of at least 0.30, a visible transmittance (Lta) of at least about 65%, a dominant wavelength in the range of from 435 nm to 570 nm, an IR transmittance (% IR) of no greater than 35%, and a UV transmittance (% UV) of no greater than 40%, and wherein the glass is substantially free of nickel.
Dependencies are inferred from the claim text.