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   Southwall Technologies  1998 Product Guide  

Residential Insulating Glass Performance Data

 

 

RESIDENTIAL INSULATING GLASS PERFORMANCE DATA

GLASS TYPE/PRODUCT CODE

GLASS
THICKNESS
Inches 

TRANSMITTANCE
%

REFLECTANCE
EXTERIOR

WINTER
NIGHTTIME
U-Value

SUMMER
DAYTIME
U-Value

SHADING
COEFFICIENT 

RELATIVE
HEAT GAIN
Btu’s/Hr/Ft²

Daylight

Solar

UV

Daylight

Solar

1"*

1 1/4"*

1"*

1 1/4"*

Heat Mirror™ Insulating Glass 

Clear Std. IG

1/8

81

69

58.0

16

13

0.49

0.50

0.52

0.51

0.88

182

HMTC88

1/8

65

38

0.50

14

27

0.21

0.18

0.25

0.22

0.58

119

HMSC75

1/8

62

29

0.50

23

40

0.24

0.21

0.29

0.25

0.41

87

HM88

1/8

72

47

0.50

19

26

0.26

0.23

0.31

0.27

0.66

136

HM77

1/8

65

36

0.50

24

38

0.25

0.22

0.29

0.25

0.52

108

HM66

1/8

55

28

0.50

33

47

0.25

0.22

0.28

0.24

0.41

85

HM55

1/8

47

23

0.50

41

52

0.24

0.21

0.28

0.23

0.35

73

HM44

1/8

39

18

0.50

50

58

0.24

0.21

0.27

0.23

0.28

69

Green Std. IG

1/8

75

51

36.0

14

9

0.49

0.50

0.54

0.54

0.69

145

HMTC88

1/8

60

30

0.50

13

15

0.21

0.18

0.25

0.22

0.47

97

HMSC75

1/8

57

25

0.50

20

21

0.24

0.21

0.29

0.25

0.37

77

HM88

1/8

66

36

0.50

17

16

0.26

0.23

0.31

0.27

0.52

109

HM77

1/8

60

29

0.50

21

21

0.25

0.22

0.29

0.26

0.43

90

HM66

1/8

51

23

0.50

29

26

0.25

0.22

0.28

0.24

0.35

74

HM55

1/8

43

19

0.50

36

29

0.24

0.21

0.28

0.24

0.30

65

HM44

1/8

36

15

0.50

43

33

0.24

0.21

0.28

0.24

0.25

55

Azurlite Std. IG

1/8

70

37

31.0

13

8

0.49

0.50

0.56

0.56

0.53

115

HMTC88

1/8

55

24

0.50

12

9

0.21

0.18

0.25

0.22

0.38

79

HMSC75

1/8

53

21

0.50

19

12

0.24

0.21

0.29

0.25

0.33

70

HM88

1/8

62

28

0.50

15

10

0.26

0.23

0.31

0.27

0.42

88

HM77

1/8

56

23

0.50

19

13

0.25

0.22

0.30

0.26

0.36

76

HM66

1/8

47

19

0.50

26

16

0.25

0.22

0.28

0.24

0.30

65

HM55

1/8

40

16

0.50

32

18

0.24

0.21

0.28

0.24

0.27

58

HM44

1/8

33

13

0.50

38

52

0.24

0.21

0.28

0.24

0.23

50

Bronze Std. IG

1/8

61

54

33.0

11

10

0.49

0.50

0.54

0.54

0.72

151

HMTC88

1/8

48

29

0.50

10

19

0.21

0.18

0.25

0.22

0.46

95

HMSC75

1/8

46

22

0.50

14

27

0.24

0.21

0.29

0.25

0.34

71

HM88

1/8

54

36

0.50

13

18

0.26

0.23

0.31

0.27

0.53

110

HM77

1/8

48

27

0.50

15

25

0.25

0.22

0.29

0.25

0.42

88

HM66

1/8

41

21

0.50

21

31

0.25

0.22

0.28

0.24

0.33

70

HM55

1/8

35

17

0.50

25

34

0.24

0.21

0.28

0.24

0.29

61

HM44

1/8

29

14

0.50

30

37

0.24

0.21

0.28

0.23

0.24

51

Gray Std. IG

1/8

54

49

31.0

10

9

0.49

0.50

0.55

0.55

0.66

140

HMTC88

1/8

43

26

0.50

9

16

0.21

0.18

0.25

0.22

0.43

89

HMSC75

1/8

42

20

0.50

13

22

0.24

0.21

0.29

0.25

0.32

67

HM88

1/8

48

33

0.50

11

16

0.26

0.23

0.31

0.27

0.49

102

HM77

1/8

44

25

0.50

13

21

0.25

0.22

0.30

0.26

0.39

82

HM66

1/8

37

19

0.50

17

26

0.25

0.22

0.28

0.24

0.31

66

HM55

1/8

31

16

0.50

21

29

0.24

0.21

0.28

0.24

0.27

58

HM44

1/8

26

13

0.50

25

31

0.24

0.21

0.28

0.24

0.23

49

*Overall unit thickness.
Performance information for other glass types and tints as well as gas fill performance is available from Southwall. Data used for Green, Blue, Bronze and Gray is that for PPG Industries Solex®, Azurlite®, Solarbronze® and Solargray®. All data calculated using 1995 Spectral Data from Lawrence Berkeley Laboratories' Window 4.1 analysis program. For metric values, contact Southwall’s Architectural Services Department at 1-800-365-8794. 


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