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Table 10: Solar Energy Transmittance and Shading Coefficients

Sheet

Transmittance (%)

Shading Coefficients

Visible
Light*

Solar
Energy

Single-Glazed

Double**
(V&H)

Vertical

Horizontal

2074 Gray
2538 Neutral Gray
2064 Gray
2537 Neutral Gray
2094 Neutral Gray
2514 Neutral Gray
2515 Neutral Gray

12%
16
27
33
45
59
76

24%
27
36
41
55
62
74

0.50
0.52
0.59
0.63
0.74
0.80
0.89

0.28
0.46
0.50
0.59
0.71
0.78
0.88

0.34
0.36
0.44
0.49
0.61
0.68
0.78

2370 Bronze
2412 Bronze
2404 Bronze
2539 Bronze
2540 Bronze

10
27
49
61
75

20
35
56
62
75

0.46
0.58
0.75
0.80
0.90

0.40
0.53
0.72
0.78
0.89

0.30
0.43
0.62
0.68
0.79

2111 Green
2092 Green
2069 Blue
Colorless

77
26
55
92

76
57
71
85

-
-
0.89
0.98

0.92
0.68
0.87
0.89

0.81
0.54
0.77
0.89

*Visible transmittance is measured using C.I.E. Source C.
**Tinted Plexiglas® sheet outside, 1/4" air space and colorless Plexiglas® sheet inside. For best control of solar heat gain, use the transparent color as the outer pane in multi-pane glazings.