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PPG ® Commercial Insulating Glass Unit Comparisons Using 1/4" (6mm) Glass*
1/4-inch (6mm) lites; interior lite clear3

 These tables provided courtesy of PPG ® will print on 8 1/2 x 11 paper in the landscape mode
Glass Type Transmittance2 Reflectance2 U-Value3
(Imperial)		 K-Value3
(Metric)		 Shading Coef-
ficient2,4		 Solar Heat Gain Coef-
ficient5
Ultra-
violet %		 Visible % Total Solar Energy % Visible Light % Total Solar Energy % Winter Night-
time		 Summer Day-
time		 Winter Night-
time		 Summer Day-
time
Uncoated
Clear Glass 50 79 61 15 12 0.48 0.55 2.74 3.13 0.81 0.70
SOLEX® Tinted Glass 25 69 39 13 8 0.48 0.57 2.74 3.25 0.56 0.49
SOLARGREEN® Tinted Glass 13 60 29 11 7 0.48 0.57 2.74 3.25 0.46 0.39
AZURLITE® Tinted Glass 34 60 27 11 7 0.48 0.57 2.75 3.26 0.44 0.38
SOLARBRONZE® Tinted Glass 21 48 39 9 8 0.48 0.57 2.74 3.25 0.58 0.50
SOLARGRAY® Tinted Glass 20 40 33 7 7 0.48 0.57 2.74 3.25 0.52 0.45
OPTIGRAY™ 23 Tinted Glass 6 21 16 5 5 0.48 0.58 2.74 3.31 0.33 0.28
GRAYLITE® Tinted Glass 6 12 20 5 5 0.48 0.58 2.74 3.31 0.38 0.33
Coated
SOLARCOOL® Glass (Reflective)
SOLARCOOL (1) AZURLITE 10 23 11 37 30 0.48 0.57 2.75 3.23 0.24 0.20
SOLARCOOL (2) AZURLITE 10 24 12 19 10 0.48 0.58 2.75 3.32 0.27 0.24
SOLARCOOL (1) Bronze 6 19 21 38 26 0.48 0.56 2.74 3.19 0.35 0.30
SOLARCOOL (2) Bronze 6 19 21 14 12 0.48 0.58 2.74 3.31 0.38 0.33
SOLARCOOL (1) Gray 6 15 18 37 30 0.48 0.56 2.74 3.19 0.31 0.27
SOLARCOOL (2) Gray 6 16 18 11 10 0.48 0.58 2.74 3.31 0.35 0.30
SUNGATE® 1000 Low-E Glass
SUNGATE 1000 (2) Clear 14 69 32 12 28 0.29 0.29 1.64 1.64 0.44 0.37
SUNGATE 1000 (3) SOLEX 8 60 24 11 11 0.29 0.30 1.64 1.69 0.41 0.36
SUNGATE 1000 (3) SOLARGREEN 4 52 20 10 8 0.29 0.30 1.64 1.69 0.35 0.30
SUNGATE 1000 (3) AZURLITE 10 53 20 9 7 0.29 0.31 1.67 1.75 0.35 0.30
SUNGATE 1000 (3) Bronze 7 41 20 8 17 0.29 0.30 1.64 1.69 0.36 0.31
SUNGATE 1000 (3) Gray 6 35 17 7 13 0.29 0.31 1.64 1.74 0.32 0.28
SUNGATE 1000 (3) OPTIGRAY 23 2 18 9 5 6 0.29 0.31 1.64 1.74 0.20 0.18
SUNGATE 1000 (3) GRAYLITE 2 11 8 5 8 0.29 0.31 1.64 1.74 0.20 0.17
SOLARCOOL® (Reflective) Glass with SUNGATE 1000 Low-E (3)
SOLARCOOL (2) AZURLITE + Low-E 3 20 8 19 10 0.29 0.31 1.67 1.79 0.18 0.16
SOLARCOOL (2) Bronze + Low-E 2 16 9 14 18 0.29 0.31 1.64 1.74 0.20 0.18
SOLARCOOL (2) Gray + Low-E 2 14 7 11 14 0.29 0.31 1.64 1.74 0.19 0.16
SUNGATE® 100 Low-E Glass
SUNGATE 100 (2) Clear 35 73 43 12 21 0.31 0.32 1.74 1.81 0.59 0.51
SUNGATE 100 (3) Clear 35 73 43 12 22 0.31 0.33 1.74 1.88 0.66 0.57
SUNGATE 100 (3) Solex 18 63 30 10 10 0.31 0.33 1.74 1.88 0.47 0.40
SUNGATE 100 (3) SOLARGREEN 9 55 23 9 7 0.31 0.33 1.74 1.88 0.38 0.32
SUNGATE 100 (3) AZURLITE 24 55 23 9 7 0.31 0.34 1.78 1.92 0.37 0.32
SUNGATE 100 (3) Bronze 15 44 27 7 13 0.31 0.33 1.74 1.88 0.45 0.39
SUNGATE 100 (3) Gray 14 36 23 7 10 0.31 0.33 1.74 1.88 0.40 0.34
SUNGATE 100 (3) OPTIGRAY 23 5 19 11 5 6 0.31 0.34 1.74 1.93 0.24 0.20
SUNGATE 100 (3) GRAYLITE 4 11 12 5 8 0.31 0.34 1.74 1.93 0.26 0.22
SOLARCOOL® Glass (Reflective) with SUNGATE 100 Low-E (3)
SOLARCOOL (2) AZURLITE + Low-E 7 21 9 19 10 0.31 0.34 1.78 1.95 0.20 0.17
SOLARCOOL (2) Bronze + Low-E 4 17 13 14 15 0.31 0.34 1.74 1.93 0.27 0.23
SOLARCOOL (2) Gray + Low-E 4 14 11 11 12 0.31 0.34 1.74 1.93 0.24 0.21
SUNGATE® 500 Low-E Glass
SUNGATE 500 (2) Clear 42 74 51 16 14 0.35 0.38 1.99 2.15 0.70 0.60
SUNGATE 500 (3) Clear 42 74 51 17 16 0.35 0.39 1.99 2.21 0.75 0.65
SUNGATE 500 (3) Solex 21 64 33 14 9 0.35 0.39 1.99 2.21 0.51 0.44
SUNGATE 500 (3) SOLARGREEN 11 56 25 12 7 0.35 0.39 1.99 2.21 0.40 0.34
SUNGATE 500 (3) AZURLITE 28 56 24 12 8 0.35 0.40 1.99 2.25 0.39 0.33
SUNGATE 500 (3) Bronze 17 44 32 9 10 0.35 0.39 1.99 2.21 0.52 0.45
SUNGATE 500 (3) Gray 17 37 27 8 8 0.35 0.39 1.99 2.21 0.45 0.39
SUNGATE 500 (3) OPTIGRAY 23 5 19 13 6 6 0.35 0.40 1.99 2.25 0.27 0.23
SUNGATE 500 (3) GRAYLITE 5 11 15 5 6 0.35 0.40 1.99 2.25 0.32 0.27
SOLARCOOL® Glass (Reflective) with SUNGATE 500 Low-E (3)
SOLARCOOL (2) AZURLITE + Low-E 8 22 10 20 10 0.35 0.40 1.99 2.28 0.22 0.19
SOLARCOOL (2) Bronze + Low-E 5 18 17 14 13 0.35 0.39 1.99 2.21 0.33 0.28
SOLARCOOL (2) Gray + Low-E 5 14 14 11 10 0.35 0.40 1.99 2.25 0.29 0.25

Performance data is based on representative samples of factory production. Actual values may vary slightly due to variations in the production process. Other glass manufacturers and coaters may use different instruments and measurement techniques. Therefore, reported performance values may vary on identical products by others.

Figures may vary due to manufacturing tolerances. All tabulated data are based on NFRC methodology, using LBL's Windows 4.1 software.

  1. Transmittance and reflectance values based on spectrophotometric measurements and energy distribution of solar radiation.
  2. U-value (K-value) is the overall coefficient of heat transmittance or heat flow measured in BTU/hr. . ft2 . °F (watts/m2.°C). Lower U-values indicate better insulating performance. Winter nighttime U-values are calculated using an outdoor air temperature of 0°F (-17.8°C), indoor air temperature of 70°F (21°C), outdoor air velocity of 15 mph (6.7 m/s), indoor air velocity of 0 mph (0 m/s) and a solar intensity of 0 BTU/hour/square foot (0 w/m2). Summer daytime U-values are calculated using an outdoor air temperature of 89°F (32°C), indoor air temperature of 75°F (24°C), outdoor air velocity of 7.5 mph (3.4 m/s), indoor air velocity of 0 mph (0 m/s), and a solar intensity of 248 BTU/hour/square foot (783 w/m2).
  3. Shading coefficient is the ratio of the total amount of solar energy that passes through a glass relative to 1/8-in. (3.0mm) thick clear glass under the same design conditions. It includes both solar energy transmitted directly plus any absorbed solar energy re-radiated and convected. Lower shading coefficient values indicate better performance in reducing summer heat gain. Shading coefficients at outdoor air temperature of 89°F (32°C), outdoor air velocity of 7.5 mph (3.4 m/s), indoor air temperature of 75°F (24°C), indoor air velocity of 0 mph (0 m/s) and solar intensity of 248 BTU/hour/square foot (783 w/m2).
  4. Solar heat gain coefficient represents the solar heat gain through the glass relative to the incident solar radiation. It is equal to 86% of the shading coefficient
 

 

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