Product Performance Data - Monolithic Glass (A) and Low-E on Clear Float Glass (A)

Product 

Coated
Surface 

Nominal
Thickness

Transmittance
Average

Reflectance
Average

N. America
U-Value
(C)

(D)
Shading
Coefficient 

(E)
Solar
Heat Gain
Coefficient 

(F)
Relative
Heat
Gain 

IN.

MM

Daylight
%

Solar
%

(B)
UV
%

Daylight
%

Solar
%

Summer

Winter

Eclipse
Clear

1
2

1/4
1/4

6
6

39
39

49
49

11
11

45
40

30
25

1.04
1.05

1.09
1.09

0.63
0.65

0.55
0.56

142
145

Eclipse
Blue-Green

1
2

1/4
1/4

6
6

33
33

28
28

6
6

45
32

30
16

1.08
1.11

1.09
1.09

0.46
0.51

0.40
0.44

107
117

Eclipse
Gray

1
2

1/4
1/4

6
6

19
19

26
26

4
4

45
13

30
10

1.09
1.11

1.09
1.08

0.44
0.51

0.38
0.44

103
118

Eclipse
Bronze

1
2

1/4
1/4

6
6

23
23

31
31

4
4

46
19

31
13

1.07
1.11

1.09
1.09

0.48
0.54

0.41
0.47

111
124

Eclipse
Gold

1
2

NA
1/4

NA
6

NA
31

NA
33

NA
2

NA
42

NA
31

NA
1.07

NA
1.09

NA
0.50

NA
0.43

NA
115

Solarcool
Gray

1
2

1/4
1/4

6
6

17
17

23
23

7
7

36
11

30
9

1.10
1.13

1.09
1.09

0.42
0.49

0.36
0.42

99
114

Solarcool
Bronze

1
2

1/4
1/4

6
6

21
21

27
27

7
7

36
13

30
11

1.09
1.12

1.09
1.09

0.46
0.52

0.39
0.45

106
120

Solarcool
Azurlite

1
2

1/4
1/4

6
6

26
26

13
13

8
8

36
19

30
10

1.11
1.14

1.09
1.09

0.34
0.41

0.29
0.35

83
98

Solarcool
Graylite

1
2

1/4
1/4

6
6

5
5

16
16

2
2

36
5

30
6

1.11
1.14

1.09
1.09

0.36
0.44

0.31
0.38

88
105

Sunglass
Reflective
Blue

1
2

1/4
1/4

6
6

19
19

22
22

8
8

39
15

32
11

1.09
1.12

1.09
1.09

0.40
0.47

0.35
0.41

95
110

Product

Coated
Surface

Nominal
Thickness

Transmittance
Average

Reflectance
Average

N. America
U-Value
(C)

(D)
Shading
Coefficient

(E)
Solar
Heat Gain
Coefficient

(F)
Relative
Heat
Gain

IN.

MM

Daylight
%

Solar
%

(B)
UV
%

Daylight
%

Solar
%

Summer

Winter

LOF
Energy
Advantage
Low-E
(1)

2
2
2
2
2

3/32
1/8
5/32
3/16
1/4

2.5
3
4
5
6

83
83
82
82
81

70
69
67
66
64

61
58
55
53
51

11
11
11
11
11

11
11
11
10
10

0.62
0.62
0.63
0.63
0.63

0.74
0.74
0.73
0.73
0.73

0.85
0.84
0.82
0.81
0.79

0.73
0.72
0.71
0.69
0.68

190
188
185
182
180

A)

Product Performance Data based on numbers available at the time of publication from Libby-Ownes-Ford, PPG Industries, Inc., and Ford Motor Company. Actual values may vary slightly. HGP reserves the right to change or modify Product Performance Data without notice as new data becomes available.

B)

The UV solar transmittance is based on the standard intensity versus wavelength (300 to 400 nanometer; air mass 2.0) for the sun's radiation when the sun is at 60 degree zenith angle and measured at normal incidence to the glass surface.

C).

U-value is the overall coefficient of the heat transmission (air to air) due only to difference in indoor and outdoor temperatures. The lower the U-value, the less heat is transmitted through a material in a given time for a given temperature difference. Winter U-values are based on an outdoor temperature of OºF, an indoor temperature of 70ºF and a 15 mph wind velocity with no sun. Summer U-values and Shading Coefficients are based on an outdoor temperature of 89ºF, an indoor temperature of 75ºF, a solar intensity of 248 Btu/Hr.-Ft, and a 7.5 mph wind velocity. U-values: Btu (hr. x ft² F). To obtain the SI (metric). U-value (W/(m² x ºC), multiply the North American U-value by 5.678.

D)

Shading Coefficient is the ratio of solar heat gain through a particular product compared to 1/8" (3mm) clear glass. It is based on the same conditions as the summer daytime U-value (see footnote C).

E).

Solar Heat Gain Coefficient represents the solar heat gain through the glass relative to the incident solar radiation. It is equal to 86/87% of the shading coefficient.

F).

Relative Heat Gain - A single value relative product index of overall heat gain. It is based on an ASHRAE solar heat gain factor of 200 Btu/Hr.-Ft and outdoor air 14°F warmer than indoor air. R.H.G. = 200 x (shade coefficient) + 14 x (summer U-value). Relative Heat Gain Units: Btu (hr. x ft²). To obtain the Sl relative heat gain (W/m²), multiply the North American relative heat gain by 3.154.