Thermal Radiation Characteristics of Some Glasses

Howard O. Mcmahon

The emissivity, reflectivity, and transmissivity have been studied for a number of glasses throughout the wave‐length region 2.2 to μ, and through a temperature range of 500° to 1500°F. In general it is found that, although the spectral emissivity varies considerably with wave length throughout the opaque portion of the spectrum, the emission spectrum is almost completely independent of temperature throughout the region of the spectrum studied. The most prominent feature of the emission spectrum of all silicate structures studied is the metallic‐reflection band at approximately 9.5 μ. Copyright © 1951, Wiley Blackwell. All rights reserved

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Materials
Curve 1
Temperature, K: 811 Wavelength Range, µm: 2.4-12.5 Geometry θ': ~0° Composition (weight percent), Specifications, and Remarks: Kimble N-51 A (3.17 mm thick); nominal composition: 74.7 SiO₂, 9.6 B₂O₂, 6.9 Na₂O and K₂O, 5.6 R₂O₂, 2.2 BaO, 0.9 CaO; ground and polished on both sides; data extracted from smooth curve.
Curve 1
Temperature, K: 811 Wavelength Range, µm: 2.4-12.5 Geometry Θ w': ~0° 2π Composition (weight percent), Specifications, and Remarks: Kimble N-51 A (3.17 mm thick); nominal composition: 74.7 SiO₂, 9.6 B₂O₂, 6.9 Na₂O and K₂O, 5.6 R₂O₂, 2.2 BaO, 0.9 CaO; ground and polished on both sides; calculated from 1- (E+τ); data extracted from smooth curve.
Curve 1
Temperature, K: 811 Wavelength Range, µm: 2.4-12.5 Geometry θ': 2π ~0° Composition (weight percent), Specifications, and Remarks: Kimble N-51 A (3.17 mm thick); nominal composition: 74.7 SiO₂, 9.6 B₂O₂, 6.9 Na₂O and K₂O, 5.6 R₂O₂, 2.2 BaO, 0.9 CaO; ground and polished on both sides; data extracted from smooth curve.
Curve 1
Temperature K: 811 Wavelength Range, µm: 2.5-12.5 Geometry: ~0° Composition (weight percent), Specifications, and Remarks: FLINT CONTAINER GLASS (3.17 mm thick); nominal composition: 71.7 SiO₂, 13.3 Na₂O and K₂O, 11.9 CaO, 1.8 R₂O₃, 0.6 BaO, and 0.3 MgO; ground and polished on both sides; sample prepared by the Owens-Illinois Co.; data extracted from smooth curve.
Curve 2
Temperature K: 811 Wavelength Range, µm: 2.5-12.4 Geometry: ~0° Composition (weight percent), Specifications, and Remarks: LOW-IRON FLINT GLASS (3.17 mm thick); nominal composition: 72.2 SiO₂, 13.0 Na₂O and K₂O, 12.7 CaO, 1.1 R₂O₃, and 3.2 MgO; ground and polished on both sides; sample prepared by the Owens-Illinois Glass Co.; data extracted from smooth curve.
Curve 3
Temperature K: 811 Wavelength Range, µm: 2.7-12.5 Geometry: ~0° Composition (weight percent), Specifications, and Remarks: TELEVISION TUBE GLASS (3.17 mm thick); containing 30 lead oxide; ground and polished on both sides; sample prepared by the Owens-Illinois Glass Co.; data extracted from smooth curve.
Curve 1
Temperature K: 811 Wavelength Range, µm: 2.5-12.5 Geometry θ θ' ω': ~0° Reported Error, %: 2π Composition (weight percent), Specifications, and Remarks: FLINT CONTAINER GLASS (3.17 mm thick); nominal composition: 71.7 SiO₂, 13.3 Na₂O and K₂O, 11.9 CaO, 1.8 R₂O₃, 0.6 BaO, 0.3 MgO; ground and polished on both sides; calculated from 1-(ε+τ); sample prepared by the Owens-Illinois Glass Co.; data extracted from smooth curve.
Curve 2
Temperature K: 811 Wavelength Range, µm: 2.5-12.5 Geometry θ θ' ω': ~0° Reported Error, %: 2π Composition (weight percent), Specifications, and Remarks: LOW-IRON FLINT GLASS (3.17 mm thick); nominal composition: 72.2 SiO₂, 13.0 Na₂O and K₂O, 12.7 CaO, 1.1 R₂O₃, and 0.2 MgO; ground and polished on both sides; calculated from 1-(E+τ); sample prepared by the Owens-Illinois Glass Co.; data extracted from smooth curve.
Curve 3
Temperature K: 811 Wavelength Range, µm: 2.5-12.5 Geometry θ θ' ω': ~0° Reported Error, %: 2π Composition (weight percent), Specifications, and Remarks: TELEVISION TUBE GLASS (3.17 mm thick); containing 30 lead oxide; ground and polished on both sides; sample prepared by the Owens-Illinois Glass Co.; calculated from 1-(ε+τ); data extracted from smooth curve.
Curve 1
Temperature K: 811 Wavelength Range, µm: 2.5-12.5 Geometry θ' ω': 2π~0° Composition (weight percent), Specifications, and Remarks: LOW-IRON FLINT GLASS (3.17 mm thick); nominal composition: 72.2 SiO₂, 13.0 Na₂O and K₂O, 12.7 CaO, 1.1 R₂O₃, and 0.2 MgO; ground and polished on both sides; sample prepared by the Owens-Illinois Glass Co.; data extracted from smooth curve.
Curve 2
Temperature K: 811 Wavelength Range, µm: 2.5-12.5 Geometry θ' ω': 2π~0° Composition (weight percent), Specifications, and Remarks: FLINT CONTAINER GLASS (3.17 mm thick); nominal composition: 71.7 SiO₂, 13.3 Na₂O and K₂O, 11.9 CaO, 1.8 R₂O₃, 0.6 BaO, and 0.3 MgO; ground and polished on both sides; sample prepared by the Owens-Illinois Glass Co.; data extracted from smooth curve.
Curve 3
Temperature K: 811 Wavelength Range, µm: 2.5-12.5 Geometry θ' ω': 2π~0° Composition (weight percent), Specifications, and Remarks: TELEVISION TUBE GLASS (3.17 mm thick); containing 30 lead oxide; ground and polished on both sides; sample prepared by the Owens-Illinois Glass Co.; data extracted from smooth curve.
Curve 1
Temperature, K: 811 Wavelength Range, µm: 2.5-12.5 Geometry θ': ~0° Composition (weight percent), Specifications, and Remarks: Pyrex 774 (3.175 mm thick); nominal composition: 81.0 SiO₂, 13.0 B₂O₃, 3.8 Na₂O and K₂O, 2.2 R₂O₂; ground and polished on both sides; data extracted from smooth curve.
Curve 2
Wavelength, µm: 9.1 Temperature Range, K: 674-1495 Geometry θ': ~0° Composition (weight percent), Specifications, and Remarks: Pyrex 774 (1.588 mm thick); ground and polished on both sides; data extracted from smooth curve.
Curve 1
Wavelength, µm: 9.1 Temperature Range, K: 678-1489 Geometry (θ, θ', W): ~0°, 2π Composition (weight percent), Specifications, and Remarks: Pyrex 774 (1.588 mm thick); ground and polished on both sides; calculated from (1-ε); data extracted from smooth curve.
Curve 1
Temperature, K: 811 Wavelength Range, µm: 2.5-12.5 Geometry (θ, θ', W): ~0°, 2π Composition (weight percent), Specifications, and Remarks: Pyrex 774 (3.175 mm thick); nominal composition: 81.0 SiO₂, 13.0 B₂O₃, 3.8 Na₂O and K₂O, 2.2 R₂O₂; ground and polished on both sides; calculated from 1 - (ε + τ); data extracted from smooth curve.
Curve 1
Temperature, K: 811 Wavelength Range, µm: 2.5-12.5 Geometry (θ', ω): 2π, ~0° Composition (weight percent), Specifications, and Remarks: Pyrex 774 (3.175 mm thick); composition: 81.0 SiO₂, 13.0 B₂O₂, 3.8 Na₂O and K₂O, 2.2 R₂O₂; ground and polished on both sides; data extracted from smooth curve.
Curve 1
Temperature K: 811 Wavelength Range, µm: 2.5-12.5 Geometry θ': ~0° Composition (weight percent), Specifications, and Remarks: Corning; nominal composition: 96.3 SiO₂, 2.9 B₂O₃, 0.04 R₂O₃, 0.04 max Na₂O and K₂O (1.59 mm thick); ground and polished on both sides; sample prepared by the Owens-Illinois Glass Co.; data extracted from smooth curve.
Curve 1
Temperature K: 811 Wavelength Range, µm: 2.4-12.5 Geometry θ θ' ω': ~0° Reported Error, %: 2π
Curve 1
Temperature K: 811 Wavelength Range, µm: 2.5-12.5 Geometry θ' ω': 2π ~0° Composition (weight percent), Specifications, and Remarks: Corning; nominal composition: 96.3 SiO₂, 2.9 B₂O₃, 0.04 R₂O₃, 0.04 max Na₂O and K₂O (1.59 mm thick); ground and polished on both sides; sample prepared by the Owens-Illinois Glass Co.; data extracted from smooth curve.