For additional info check out the PPG link to the right.  You can see detailed comparisons and a glass performance calculator

GSI procures superior quality glass products from the major Architectural Glass Manufactures nationwide. Because of the vast assortment and combinations of high performance coating, thickness and colors, it would be impossible to list them all here. The following indicate a sampling of the most commonly used make-ups for overhead glazing and their associated properties. We would recommend consulting with your design professional in selecting the appropriate glass type for your application or contact GSI's Engineering Department for further information.

Insulating

Exterior

Aesthetic

L-T

Daylight Reflectance

Winter Nightime

Summer Daytime

Shading

UV*

Glass Type

Appearance

Effects

%

out%

in%

U/R

U/R

Coefficient

Transmittance

Clear

Clear

Transparent

80

15

15

.49/2.04

.56/1.79

0.82

<1%

Bronze

Tinted

Light Brown

47

9

13

.49/2.04

.57/1.75

0.57

<1%

Gray

Tinted

Light Gray

37

8

13

.49/2.04

.57/1.75

0.55

<1%

Clear Low-E

Reflective

Transparent

76

13

12

.30/3.333

.32/3.13

0.67

<1%

Reflective (2) Bronze

Reflective

Dark Brown

20

15

37

.49/2.04

.58/1.72

0.38

<1%

* Based on laminated glass as the interior lite of the insulating unit