Interactive Glass Performance Calculator

Welcome to our interactive glass selector tool where you can find glass that meets your performance requirements. To get started, input your required performance data below.

Select your glass type:

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26
Description Normal Thickness Visible Light Transmission U Value Solar Heat Gain Coefficient

KlymetControl IGU incorporating 3mm EnviroClear, 12mm cavity, 3mm EnviroClear

3+12+3 80.00 2.60 0.76

KlymetControl IGU incorporating 4mm EnviroClear, 12mm cavity, 4mm EnviroClear

4+12+4 80.00 2.60 0.74

KlymetControl IGU incorporating 5mm EnviroClear, 12mm cavity, 5mm EnviroClear

5+12+5 79.00 2.50 0.72

KlymetControl IGU incorporating 6mm EnviroClear, 12mm cavity, 6mm EnviroClear

6+12+6 78.00 2.50 0.70

KlymetControl IGU incorporating 8mm EnviroClear, 12mm cavity, 6mm EnviroClear

8+12+6 77.00 2.50 0.67

KlymetControl IGU incorporating 10mm EnviroClear, 12mm cavity, 6mm EnviroClear

10+12+6 76.00 2.50 0.64

KlymetControl IGU incorporating 12mm EnviroClear, 12mm cavity, 6mm EnviroClear

12+12+6 75.00 2.50 0.60

KlymetControl IGU incorporating 4mm EnviroTone Grey, 12mm cavity, 4mm EnviroClear

4+12+4 49.00 2.60 0.57

KlymetControl IGU incorporating 5mm EnviroTone Grey, 12mm cavity, 5mm EnviroClear

5+12+5 42.00 2.50 0.52

KlymetControl IGU incorporating 6mm EnviroTone Grey, 12mm cavity, 6mm EnviroClear

6+12+6 37.00 2.50 0.48

KlymetControl IGU incorporating 10mm EnviroTone Grey, 12mm cavity, 6mm EnviroClear

10+12+6 24.00 2.50 0.36

KlymetControl IGU incorporating 12mm EnviroTone Grey, 12mm cavity, 6mm EnviroClear

12+12+6 17.00 2.50 0.33

KlymetControl IGU incorporating 4mm EnviroTone Green, 12mm cavity, 4mm EnviroClear

4+12+4 73.00 2.60 0.56

KlymetControl IGU incorporating 5mm EnviroTone Green, 12mm cavity, 5mm EnviroClear

5+12+5 70.00 2.50 0.50

KlymetControl IGU incorporating 6mm EnviroTone Green, 12mm cavity, 6mm EnviroClear

6+12+6 2.50 0.48

KlymetControl IGU incorporating 10mm EnviroTone Green, 12mm cavity, 6mm EnviroClear

10+12+6 56.00 2.50 0.37

KlymetControl IGU incorporating 4mm EnviroTone Bronze, 12mm cavity, 4mm EnviroClear

4+12+4 53.00 2.60 0.58

KlymetControl IGU incorporating 5mm EnviroTone Bronze, 12mm cavity, 5mm EnviroClear

5+12+5 47.00 2.50 0.53

KlymetControl IGU incorporating 6mm EnviroTone Bronze, 12mm cavity, 6mm EnviroClear

6+12+6 45.00 2.50 0.49

KlymetControl IGU incorporating 10mm EnviroTone Bronze, 12mm cavity, 6mm EnviroClear

10+12+6 27.00 2.50 0.37

KlymetControl IGU incorporating 6mm EnviroTone Ocean Blue, 12mm cavity, 6mm EnviroClear

6+12+6 48.00 3.10 0.47

KlymetControl IGU incorporating 6.38mm Protekta Clear, 12mm cavity, 6mm EnviroClear

6.38+12+6 76.00 2.50 0.67

KlymetControl IGU incorporating 6.38mm Protekta Grey, 12mm cavity, 6mm EnviroClear

6.38+12+6 36.00 2.50 0.49

KlymetControl IGU incorporating 6.38mm Protekta Bronze, 12mm cavity, 6mm EnviroClear

6.38+12+6 42.00 2.50 0.50

KlymetControl IGU incorporating 6.38mm Protekta Translucent, 12mm cavity, 6mm EnviroClear

6.38+12+6 48.00 2.50 0.50

KlymetControl IGU incorporating 6.38mm Protekta Green +, 12mm cavity, 6mm EnviroClear

6.38+12+6 59.00 2.50 0.40

KlymetControl IGU incorporating 4mm EnviroTone+ Green, 12mm cavity, 4mm EnviroClear

4+12+4 65.00 2.60 0.47

KlymetControl IGU incorporating 5mm EnviroTone+ Green, 12mm cavity, 5mm EnviroClear

5+12+5 64.00 2.50 0.46

KlymetControl IGU incorporating 6mm EnviroTone+ Green, 12mm cavity, 6mm EnviroClear

6+12+6 58.00 2.50 0.39

KlymetControl IGU incorporating 4mm EnviroTone+ Grey, 12mm cavity, 4mm EnviroClear

4+12+4 15.00 2.50 0.26

KlymetControl IGU incorporating 6mm EnviroTone+ Grey, 12mm cavity, 6mm EnviroClear

6+12+6 8.00 2.50 0.21

KlymetControl IGU incorporating 6mm EnviroTone+ Blue, 12mm cavity, 6mm EnviroClear

6+12+6 47.00 2.50 0.39

KlymetControl IGU incorporating 10mm EnviroTone+ Blue, 12mm cavity, 6mm EnviroClear

10+12+6 36.00 2.50 0.31

KlymetControl IGU incorporating 4mm Stopsol Bronze, 12mm cavity, 4mm EnviroClear (#2)

4+12+4 24.00 2.60 0.43

KlymetControl IGU incorporating 6mm Stopsol Bronze, 12mm cavity, 6mm EnviroClear (#2)

6+12+6 20.00 2.70 0.34

KlymetControl IGU incorporating 4mm Stopsol Grey, 12mm cavity, 4mm EnviroClear (#2)

4+12+4 22.00 2.60 0.41

KlymetControl IGU incorporating 6mm Stopsol Grey, 12mm cavity, 6mm EnviroClear (#2)

6+12+6 17.00 2.70 0.32

KlymetControl IGU incorporating 6mm Solarflex Blue, 12mm cavity, 6mm EnviroClear (#2)

6+12+6 18.00 2.60 0.28

KlymetControl IGU incorporating 4mm KlymetShield Clear (#2), 12mm cavity, 4mm EnviroClear

4+12+4 75.00 1.60 0.64

KlymetControl IGU incorporating 6mm KlymetShield Clear (#2), 12mm cavity, 6mm EnviroClear

6+12+6 73.00 1.60 0.61

KlymetControl IGU incorporating 4mm KlymetShield Neutral (#2), 12mm cavity, 4mm EnviroClear

4+12+4 55.00 1.60 0.46

KlymetControl IGU incorporating 6mm KlymetShield Neutral (#2), 12mm cavity, 6mm EnviroClear

6+12+6 56.00 1.60 0.45

KlymetControl IGU incorporating 4mm KlymetShield Grey (#2), 12mm cavity, 4mm EnviroClear

4+12+4 45.00 1.60 0.46

KlymetControl IGU incorporating 6mm KlymetShield Grey (#2), 12mm cavity, 6mm EnviroClear

6+12+6 35.00 1.70 0.39

KlymetControl IGU incorporating 4mm KlymetShield Green (#2), 12mm cavity, 4mm EnviroClear

4+12+4 68.00 1.70 0.49

KlymetControl IGU incorporating 6mm KlymetShield Green (#2), 12mm cavity, 6mm EnviroClear

6+12+6 63.00 1.60 0.41

KlymetControl IGU incorporating 4mm KlymetShield Green+ (#2), 12mm cavity, 4mm EnviroClear

4+12+4 61.00 1.60 0.39

KlymetControl IGU incorporating 6mm KlymetShield Green+ (#2), 12mm cavity, 6mm EnviroClear

6+12+6 54.00 1.60 0.32

KlymetControl IGU incorporating 6.38mm KlymetShield Laminated Clear (#2), 12mm cavity, 6mm EnviroClear

6.38+12+6 73.00 1.60 0.60

KlymetControl IGU incorporating 8.38mm KlymetShield Laminated Clear (#2), 12mm cavity, 6mm EnviroClear

8.38+12+6 72.00 1.60 0.58

KlymetControl IGU incorporating 10.38mm KlymetShield Laminated Clear (#2), 12mm cavity, 6mm EnviroClear

10.38+12+6 71.00 1.60 0.56

KlymetControl IGU incorporating 12.38mm KlymetShield Laminated Clear (#2), 12mm cavity, 6mm EnviroClear

12.38+12+6 70.00 1.60 0.54

KlymetControl IGU incorporating 8.38mm KlymetShield Laminated Neutral (#2), 12mm cavity, 6mm EnviroClear

8.38+12+6 53.00 1.60 0.42

KlymetControl IGU incorporating 8.38mm KlymetShield Laminated Grey (#2), 12mm cavity, 6mm EnviroClear

8.38+12+6 33.00 1.60 0.31

KlymetControl IGU incorporating 8.38mm KlymetShield Laminated Green+ (#2), 12mm cavity, 6mm EnviroClear

8.38+12+6 44.00 1.60 0.29

KlymetControl IGU incorporating 6mm Evantage Grey (#2), 12mm cavity, 6mm EnviroClear

6+12+6 29.00 1.70 0.33

KlymetControl IGU incorporating 6mm Evantage Blue Green (#2), 12mm cavity, 6mm EnviroClear

6+12+6 51.00 1.70 0.38

KlymetControl IGU incorporating 6mm Evantage Clear (#2), 12mm cavity, 6mm EnviroClear

6+12+6 60.00 1.70 0.55

KlymetControl IGU incorporating 6mm Evantage SuperGreen (#2), 12mm cavity, 6mm EnviroClear

6+12+6 43.00 1.70 0.29

KlymetControl IGU incorporating 6mm Evantage SuperBlue (#2), 12mm cavity, 6mm EnviroClear

6+12+6 35.00 1.70 0.29

KlymetControl IGU incorporating 4mm SolTech Neutral (#2), 12mm cavity, 4mm EnviroClear

4+12+4 55.00 1.60 0.46

KlymetControl IGU incorporating 6mm SolTech Neutral (#2), 12mm cavity, 6mm EnviroClear

6+12+6 56.00 1.60 0.45

KlymetControl IGU incorporating 6mm SolTech Grey (#2), 12mm cavity, 6mm EnviroClear

6+12+6 27.00 1.60 0.28

KlymetControl IGU incorporating 4mm Sunergy Clear (#2), 12mm cavity, 6mm EnviroClear

4+12+4 61.00 1.90 0.53

KlymetControl IGU incorporating 6mm Sunergy Clear (#2), 12mm cavity, 6mm EnviroClear

6+12+6 60.00 1.90 0.51

KlymetControl IGU incorporating 10mm Sunergy Clear (#2), 12mm cavity, 6mm EnviroClear

10+12+6 55.00 1.80 0.49

KlymetControl IGU incorporating 6mm Sunergy Green (#2), 12mm cavity, 6mm EnviroClear

6+12+6 49.00 1.90 0.33

KlymetControl IGU incorporating 6mm Sunergy Azur (#2), 12mm cavity, 6mm EnviroClear

6+12+6 49.00 1.90 0.35

KlymetControl IGU incorporating 3mm EnviroClear, 12mm cavity, 4mm KlymetShield Clear (#3)

3+12+4 74.00 1.60 0.71

KlymetControl IGU incorporating 4mm EnviroClear, 12mm cavity, 4mm KlymetShield Clear (#3)

4+12+4 74.00 1.60 0.69

KlymetControl IGU incorporating 5mm EnviroClear, 12mm cavity, 5mm KlymetShield Clear (#3)

5+12+5 72.00 1.60 0.66

KlymetControl IGU incorporating 6mm EnviroClear, 12mm cavity, 6mm KlymetShield Clear (#3)

6+12+6 73.00 1.60 0.66

KlymetControl IGU incorporating 8mm EnviroClear, 12mm cavity, 6mm KlymetShield Clear (#3)

8+12+6 72.00 1.60 0.63

KlymetControl IGU incorporating 10mm EnviroClear, 12mm cavity, 6mm KlymetShield Clear (#3)

10+12+6 70.00 1.60 0.60

KlymetControl IGU incorporating 12mm EnviroClear, 12mm cavity, 6mm KlymetShield Clear (#3)

12+12+6 70.00 1.60 0.55

KlymetControl IGU incorporating 4mm EnviroTone Grey, 12mm cavity, 4mm KlymetShield Clear (#3)

4+12+4 45.00 1.60 0.51

KlymetControl IGU incorporating 5mm EnviroTone Grey, 12mm cavity, 5mm KlymetShield Clear (#3)

5+12+5 40.00 1.60 0.48

KlymetControl IGU incorporating 6mm EnviroTone Grey, 12mm cavity, 6mm KlymetShield Clear (#3)

6+12+6 35.00 1.60 0.43

KlymetControl IGU incorporating 10mm EnviroTone Grey, 12mm cavity, 6mm KlymetShield Clear (#3)

10+12+6 22.00 1.60 0.30

KlymetControl IGU incorporating 12mm EnviroTone Grey, 12mm cavity, 6mm KlymetShield Clear (#3)

12+12+6 16.00 1.60 0.27

KlymetControl IGU incorporating 4mm EnviroTone Green, 12mm cavity, 4mm KlymetShield Clear (#3)

4+12+4 67.00 1.60 0.51

KlymetControl IGU incorporating 5mm EnviroTone Green, 12mm cavity, 5mm KlymetShield Clear (#3)

5+12+5 65.00 1.60 0.46

KlymetControl IGU incorporating 6mm EnviroTone Green, 12mm cavity, 6mm KlymetShield Clear (#3)

6+12+6 63.00 1.60 0.43

KlymetControl IGU incorporating 10mm EnviroTone Green, 12mm cavity, 6mm KlymetShield Clear (#3)

10+12+6 52.00 1.60 0.31

KlymetControl IGU incorporating 4mm EnviroTone Bronze, 12mm cavity, 4mm KlymetShield Clear (#3)

4+12+4 49.00 1.60 0.53

KlymetControl IGU incorporating 5mm EnviroTone Bronze, 12mm cavity, 5mm KlymetShield Clear (#3)

5+12+5 45.00 1.60 0.48

KlymetControl IGU incorporating 6mm EnviroTone Bronze, 12mm cavity, 6mm KlymetShield Clear (#3)

6+12+6 41.00 1.60 0.44

KlymetControl IGU incorporating 10mm EnviroTone Bronze, 12mm cavity, 6mm KlymetShield Clear (#3)

10+12+6 25.00 1.60 0.31

KlymetControl IGU incorporating 6mm EnviroTone Ocean Blue, 12mm cavity, 6mm KlymetShield Clear (#3)

6+12+6 48.00 1.60 0.47

KlymetControl IGU incorporating 6.38mm Protekta Clear, 12mm cavity, 6mm KlymetShield Clear (#3)

6.38+12+6 71.00 1.60 0.64

KlymetControl IGU incorporating 6.38mm Protekta Grey, 12mm cavity, 6mm KlymetShield Clear (#3)

6.38+12+6 34.00 1.60 0.44

KlymetControl IGU incorporating 6.38mm Protekta Bronze, 12mm cavity, 6mm KlymetShield Clear (#3)

6.38+12+6 40.00 1.60 0.46

KlymetControl IGU incorporating 6.38mm Protekta Green, 12mm cavity, 6mm KlymetShield Clear (#3)

6.38+12+6 58.00 1.60 0.56

KlymetControl IGU incorporating 6.38mm Protekta Translucent, 12mm cavity, 6mm KlymetShield Clear (#3)

6.38+12+6 45.00 1.60 0.46

KlymetControl IGU incorporating 6.38mm Protekta Green +, 12mm cavity, 6mm KlymetShield Clear (#3)

6.38+12+6 55.00 1.60 0.35

KlymetControl IGU incorporating 4mm EnviroTone+ Green, 12mm cavity, 4mm KlymetShield Clear (#3)

4+12+4 60.00 1.60 0.41

KlymetControl IGU incorporating 5mm EnviroTone+ Green, 12mm cavity, 5mm KlymetShield Clear (#3)

5+12+5 61.00 1.60 0.41

KlymetControl IGU incorporating 6mm EnviroTone+ Green, 12mm cavity, 6mm KlymetShield Clear (#3)

6+12+6 54.00 1.60 0.34

KlymetControl IGU incorporating 4mm EnviroTone+ Grey, 12mm cavity, 4mm KlymetShield Clear (#3)

4+12+4 14.00 1.60 0.20

KlymetControl IGU incorporating 6mm EnviroTone+ Grey, 12mm cavity, 6mm KlymetShield Clear (#3)

6+12+6 7.00 1.60 0.15

KlymetControl IGU incorporating 4mm EnviroTone+ Blue, 12mm cavity, 4mm KlymetShield Clear (#3)

4+12+4 54.00 1.60 0.43

KlymetControl IGU incorporating 6mm EnviroTone+ Blue, 12mm cavity, 6mm KlymetShield Clear (#3)

6+12+6 43.00 1.60 0.34

KlymetControl IGU incorporating 4mm Stopsol Bronze, 12mm cavity, 4mm KlymetShield Clear (#3)

4+12+4 23.00 1.60 0.37

KlymetControl IGU incorporating 6mm Stopsol Bronze, 12mm cavity, 6mm KlymetShield Clear (#3)

6+12+6 18.00 1.60 0.29

KlymetControl IGU incorporating 4mm Stopsol Grey, 12mm cavity, 4mm KlymetShield Clear (#3)

4+12+4 21.00 1.60 0.36

KlymetControl IGU incorporating 6mm Stopsol Grey, 12mm cavity, 6mm KlymetShield Clear (#3)

6+12+6 16.00 1.60 0.37

KlymetControl IGU incorporating 4mm KlymetShield Clear (#2), 12mm cavity, 4mm KlymetShield Clear (#3)

4+12+4 69.00 1.50 0.61

KlymetControl IGU incorporating 6mm KlymetShield Clear (#2), 12mm cavity, 6mm KlymetShield Clear (#3)

6+12+6 67.00 1.50 0.59

KlymetControl IGU incorporating 4mm KlymetShield Neutral (#2), 12mm cavity, 4mm KlymetShield Clear (#3)

4+12+4 51.00 1.50 0.44

KlymetControl IGU incorporating 6mm KlymetShield Neutral (#2), 12mm cavity, 6mm KlymetShield Clear (#3)

6+12+6 52.00 1.50 0.43

KlymetControl IGU incorporating 4mm KlymetShield Grey (#2), 12mm cavity, 4mm KlymetShield Clear (#3)

4+12+4 42.00 1.50 0.43

KlymetControl IGU incorporating 6mm KlymetShield Grey (#2), 12mm cavity, 6mm KlymetShield Clear (#3)

6+12+6 33.00 1.50 0.37

KlymetControl IGU incorporating 4mm KlymetShield Green (#2), 12mm cavity, 4mm KlymetShield Clear (#3)

4+12+4 63.00 1.50 0.46

KlymetControl IGU incorporating 6mm KlymetShield Green (#2), 12mm cavity, 6mm KlymetShield Clear (#3)

6+12+6 59.00 1.50 0.39

KlymetControl IGU incorporating 4mm KlymetShield Green+ (#2), 12mm cavity, 4mm KlymetShield Clear (#3)

4+12+4 57.00 1.50 0.37

KlymetControl IGU incorporating 6mm KlymetShield Green+ (#2), 12mm cavity, 6mm KlymetShield Clear (#3)

6+12+6 50.00 1.50 0.31

KlymetControl IGU incorporating 6mm KlymetShield Grey+ (#2), 12mm cavity, 6mm KlymetShield Clear (#3)

6+12+6 27.00 1.50 0.31

KlymetControl IGU incorporating 6mm KlymetShield Blue Green (#2), 12mm cavity, 6mm KlymetShield Clear (#3)

6+12+6 48.00 1.50 0.36

KlymetControl IGU incorporating 6mm Evantage Clear (#2), 12mm cavity, 6mm KlymetShield Clear (#3)

6+12+6 56.00 1.50 0.53

KlymetControl IGU incorporating 6mm Evantage SuperGreen (#2), 12mm cavity, 6mm KlymetShield Clear (#3)

6+12+6 40.00 1.50 0.27

KlymetControl IGU incorporating 6mm Evantage SuperBlue (#2), 12mm cavity, 6mm KlymetShield Clear (#3)

6+12+6 33.00 1.50 0.27

KlymetControl IGU incorporating 4mm SolTech Neutral (#2), 12mm cavity, 4mm KlymetShield Clear (#3)

4+12+4 51.00 1.50 0.44

KlymetControl IGU incorporating 6mm SolTech Neutral (#2), 12mm cavity, 6mm KlymetShield Clear (#3)

6+12+6 52.00 1.50 0.43

KlymetControl IGU incorporating 6mm SolTech Grey (#2), 12mm cavity, 6mm KlymetShield Clear (#3)

6+12+6 25.00 1.50 0.27

KlymetControl IGU incorporating 4mm Sunergy Clear (#2), 12mm cavity, 4mm KlymetShield Clear (#3)

4+12+4 61.00 1.90 0.53

KlymetControl IGU incorporating 6mm Sunergy Clear (#2), 12mm cavity, 6mm KlymetShield Clear (#3)

6+12+6 60.00 1.90 0.51

KlymetControl IGU incorporating 10mm Sunergy Clear (#2), 12mm cavity, 6mm KlymetShield Clear (#3)

10+12+6 55.00 1.80 0.49

KlymetControl IGU incorporating 6mm Sunergy Green (#2), 12mm cavity, 6mm KlymetShield Clear (#3)

6+12+6 49.00 1.90 0.33

KlymetControl IGU incorporating 6mm Sunergy Azur (#2), 12mm cavity, 6mm KlymetShield Clear (#3)

6+12+6 49.00 1.90 0.35
78
Description Normal Thickness Visible Light Transmission U Value Solar Heat Gain Coefficient

OptEma IGU incorporating 4mm EnviroClear, 12mm cavity, 4mm OptEma (#3)

4+12+4 80.00 1.40 0.60

OptEma IGU incorporating 6mm EnviroClear, 12mm cavity, 6mm OptEma (#3)

6+12+6 79.00 1.39 0.58

OptEma IGU incorporating 4mm EnviroTone Grey, 12mm cavity, 4mm OptEma (#3)

4+12+4 50.00 1.40 0.42

OptEma IGU incorporating 6mm EnviroTone Grey, 12mm cavity, 6mm OptEma (#3)

6+12+6 37.00 1.39 0.34

OptEma IGU incorporating 4mm Matlucent, 12mm cavity, 4mm OptEma (#3)

4+12+4 80.00 1.40 0.60

OptEma IGU incorporating 6mm Matlucent, 12mm cavity, 6mm OptEma (#3)

6+12+6 79.00 1.39 0.58

OptEma IGU incorporating 6.5mm Silencia, 12mm cavity, 6mm OptEma (#3)

6.5+12+6 77.00 1.37 0.53

OptEma IGU incorporating 6.38mm Protekta Clear, 12mm cavity, 6mm OptEma (#3)

6.38+12+6 78.00 1.38 0.53

OptEma IGU incorporating 6.38mm Protekta White Trans, 12mm cavity, 6mm OptEma (#3)

6.38+12+6 52.00 1.38 0.44

OptEma IGU incorporating 7.52mm SecurView, 12mm cavity, 6mm OptEma (#3)

7.52+12+6 76.00 1.38 0.52

Notes: 

1. In the case of double glazing, EnviroClear™ clear float glass or KlymetShield™ low emissivity glass (Low E) is used as the backing glass, i.e Grey 6.38mm lam +12mm air + 6mm clear float (or 6mm clear low E where specified).

2. Values are calculated using LBL Windows 5.2 software to NFRC-100 - 2001 conditions.

3. Where # appears next to the product name this indicates the position of the coated surface of the glass. 

4. Glass surfaces are counted from the exterior face of the building, the first thickness indicated is the outer glass thickness, 12 is the airspace and then the thickness of the inner panel.

5. The values given are centre of glass values and the performance will differ to that of a window assembly using these products. Window frames, gaps, etc. will affect the performance of a whole assembly.

6. The above information to the best of our knowledge accurate, however Flat Glass Industries Limited disclaims any liability for loss or damage arising from such data.

7. It is recommended that a thermal assessment be carried out prior to specifying any type of performance glass to determine risk of thermal breakage.

Definitions of Values                    

1. Visible Trans. - Percentage of visible light that can pass directly through the glass - the higher the value the more visible light that will pass through.

2. Visible Refl. - Percentage of visible light that is reflected.

3. Solar Trans. - Percentage of solar energy and normal incident light passing through the glass.

4. Solar Refl. - Percentage of solar energy and normal incident light reflected out.

4. UV trans. - Percentage of UV light transmitted measured in the light range of 300 - 380nm. The lower the number the better.

5. U Value - measured in watts per m2 per degree Celsius (w/m2°C) and is a measure of the rate of heat gain or loss through the glass.

6. Shading Co. - Shading coefficient is the ratio of solar heat gain through the glass relative to that through 3mm clear glass. The lower the number the better the performance.

7. SHGC - Solar Heat Gain Coefficient - The proportion of total solar radiation that is transferred through the glass at normal incidence, it comprises the direct solar transmission (3. Solar Trans.) and part of the solar absorption dissipated inwards by radiation and convection. The lower the number the better the solar performance.

¹ - are trademarks of Viridian
² - are trademarks of AGC
³ - are trademarks of Taiwan Glass