Action Glass
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How It Works Features Comparisons
Glass Performance Comparison Chart (effective June 30, 2004)
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R



Description
Construction














Transmittance
(%)
Reflectivity
(%)
ASHRAE
Winter
European
The Competition's Standard Glass Single Glazing
Can only be used in unconditioned rooms designed for "part-time" use!
1
 
 
Clear Single Glazing
90
83
73
9
9
58
17
0.99
0.85
213
1.10
0.9
5.60
672
2
 
 
Bronze Single Glazing
67
64
39
7
7
58
17
0.84
0.72
183
1.10
0.9
5.60
577
3
 
 
Green Single Glazing
76
48
28
7
8
58
17
0.71
0.61
158
1.10
0.9
5.60
498
4
 
 
Azurlite Single Glazing (Blue)
77
43
36
8
8
58
17
0.67
0.57
149
1.10
0.9
5.60
469
7
 
 
Grey Single Glazing
60
58
37
6
7
58
17
0.79
0.68
174
1.10
0.9
5.60
547
The Competition's Standard Glass Double Glazing
Does not allow for comfortable, cost-effective year-round living.
Better than Single Glazing but still not energy efficient.
20
 
 
Clear / Clear
81
69
58
16
16
34
46
0.88
0.75
183
0.49
2.0
2.60
576
21
 
 
Bronze / Clear
61
54
33
11
14
34
46
0.72
0.62
151
0.49
2.0
2.60
475
23
 
 
Azurlite / Clear (Blue)
70
37
31
13
15
34
46
0.54
0.46
115
0.49
2.0
2.60
361
 
 
 
Green / Clear
69
42
24
12
14
34
46
0.59
0.50
125
0.49
2.0
2.60
393
 
 
 
Grey / Clear
55
50
31
9
14
34
46
0.67
0.57
141
0.49
2.0
2.60
445
The Competition's Optional Glass High-Performance Double Glazing
Offers comfortable year-round living but at a significant price increase and an extended lead time.
30
 
 
Solar Cool Bronze / SG500
22
23
8
37
24
15
52
0.38
0.32
81
0.35
2.8
1.90
254
 
 
 
Solar Cool Bronze / Argon / SB60VT
21
11
3
37
17
-5
57
0.23
0.20
52
0.34
2.9
1.80
165
 
 
 
Solar Cool Gray / HM-44 / Clear
10
6
0
39
54
8
54
0.13
0.12
32
0.31
3.2
1.70
99
 
 
 
Solar Bronze / HM-44 / Clear
28
14
0
30
14
8
14
0.24
0.21
53
0.31
3.2
1.70
167
 
 
 
LoE2 / Argon / Clear
72
38
16
11
12
-8
56
0.47
0.41
97
0.26
3.85
1.40
309
Four Seasons' Standard Glass CONSERVAGLASS SELECTTM
Exclusive High Performance Insulated Safety Glass
Tempered safety glass which incorporates advanced exotic coating technology with Argon gas filling and exterior glass cleaning and protection features. Ensures superior performance and life expectancy for years of comfortable, cost-effective year-round living.

74

 
MC-56 / Argon / Clear
56
29
13
10
17
-8
57
0.38
0.33
79
0.25
4.0
1.30
251
78
 

MC-16 / Argon / Clear
16
10
7
11
25
-8
57
0.18
0.15
39
0.25
4.0
1.20
123
78L
 

MC-16 / Argon / Lami
15
9
1
11
24
-8
57
0.17
0.15
38
0.24
4.2
1.21
120
HIGHLY RECOMMENDED
(C.) CODE 74 - can be used for roof in cold climates.
(E.) VISIBLE LIGHT (Glare) - The lower the better. A measure of that portion of total solar radiation visible to the human eye. Note: the glare caused by too much light can cause discomfort. Codes 74 and 78 have excellent glare control.
(G.) UV (Ultraviolet) - The lower the better. Accounts for about 50% of fabric fading. Eliminating all UV reduces fading by 50%.
(H. & I.) REFLECTIVITY - Choose a low number in the vertical area for best clarity and lowest reflectivity.
(J.) CONDENSATION - The lower the better. Occurs at this outside temperature with 60% inside relative humidity.
(K.) ASHRAE CONDITIONS - 15mph wind, 0o outside, 70o inside (winter). 7.5 mph wind, 89o outside, 75o inside (summer).
(L.) SHADING COEFFICIENT - The lower the better. Ratio of solar gain to 1/8" clear glass.
(M.) SOLAR HEAT GAIN COEFFICIENT - The lower the better. Ratio of total solar heat energy transmitted and absorbed by each layer of a glazing system.
(N.) RELATIVE HEAT GAIN - The lower the better. Amount of BTU's gained per hour per square foot of glass.
(O.) U-VALUE - BTU/HR/SQ. FT./oF The lower the better (R=1/U).
(P.) R-VALUE - The higher the better.
(Q. & R.) EUROPEAN RATINGS - Similar to US (O & P) European Environmental Conditions are Winter Temp Out=32F, Temp In=68F, Wind=7.8 mph, Direct solar=0, T Sky=32F, Summer, Temp Out=89F, Temp In=68F, Wind=7.8 mph, Direct Solar=248.2 Btu/h ft. sq, T Sky=89F.
Source: LAWRENCE BERKELY LAB
Windows 4.1 ALL values are center of glass for vertical glass. Calculations based on 90% gas fill rate. All values are based on 1/8" lites of glass with 5/8" airspace (7/8" overall).

CONSERVAGLASS SELECTTM is a registered trademark of Four Seasons Solar Products LLC.

The use of breather tubes for higher altitudes may negatively impact the performance value documented in this chart.
 
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