Performance Data Sheets

Comprehensive Glass Data and Specifications

Darlington Railway station rooftop

Performance Data

Pilkington Clear and Body Tinted Outer Panes

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Product Description
6mm clear
6mm clear (low iron)
6mm 75/59 (Green)
6mm 49/58 (Bronze)
6mm 45/58 (Grey)
6mm 46/58 (Blue)
6mm Self Cleaning (Activ) Clear
6mm Self Cleaning (Activ) Blue
6mm Self Cleaning (Activ) Neutral
Light %
Transmittance
0.82
0.83
0.73
0.56
0.51
0.46
0.70
0.41
0.41
Reflectance
0.12
0.12
0.10
0.08
0.07
0.07
0.21
0.16
0.30
Solar Radiant Heat %
Direct
0.62
0.64
0.43
0.42
0.40
0.25
0.42
0.21
0.25
Reflectance
0.21
0.23
0.10
0.13
0.12
0.07
0.37
0.16
0.30
Absorption
0.17
0.13
0.47
0.45
0.48
0.68
0.21
0.63
0.44
G-Value
0.71
0.74
0.50
0.50
0.48
0.32
0.50
0.26
0.31
Shading Coefficient %
Short Wavelength
0.71
0.74
0.49
0.48
0.46
0.29
NS
NS
NS
Long Wavelength
0.11
0.11
0.08
0.09
0.09
0.07
NS
NS
NS
Total Transmission
0.82
0.85
0.57
0.57
0.55
0.36
0.57
0.30
0.36

The table above shows performance data relating to the most common solar control glasses available on the market.

The values are based on double glazed units incorporating inner panes of 6mm low e clear glass and the outer pane is as shown in the table.

The centre pane U-value of the above specifications when incorporating inner panes of standard soft coat low e clear glass and argon filled warm edge cavities is 1.15 W/m²K.

The first two items show information pertaining to clear glass (without solar control) to aid in comparison to the other products.

Even clear glass in a low e double glazed unit (which most people believe allows 100% of light through) actually blocks 22% of visible light from entering the building.  This is worth bearing in mind when considering the correct product for your solar control requirements.

Performance Data

Guardian Sunguard Super Neutral High Performance Outer Panes

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Product Description
6mm Super Neutral 70
6mm Super Neutral 62
6mm Super Neutral 51
6mm Super Neutral 40
6mm Super Neutral 29
Light %
Transmittance
0.70
0.63
0.51
0.40
0.29
Reflectance
0.14
0.12
0.14
0.16
0.17
Solar Radiant Heat %
Direct
0.33
0.31
0.25
0.21
0.16
Reflectance
0.42
0.37
0.38
0.36
0.33
Absorption
0.25
0.31
0.37
0.43
0.51
G-Value
0.35
0.38
0.27
0.23
0.18
Shading Coefficient %
Short Wavelength
NS
NS
NS
NS
NS
Long Wavelength
NS
NS
NS
NS
NS
Total Transmission
0.40
0.38
0.31
0.27
0.21

The table above shows performance data relating to high performance neutral solar control glasses available on the market with normal lead-in times

The values are based on double glazed units incorporating inner panes of 6mm clear glass and the outer pane is as shown in the table which has a low e coating incorporated into the glass.

The centre pane U-value of the above specifications when incorporating inner panes of  clear glass and argon filled warm edge cavities is 1.0 W/m²K.

These glasses are popular due to high light transmission values combined with a neutral tint rather than the body tinted coloured glasses available.

Performance Data

Saint-Gobain Coolite High Performance Outer Panes

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Product Description
6mm Coolite Xtreme 70/33 II
6mm Coolite Xtreme 61/29 II
6mm Coolite Xtreme 50/22 II
6mm Coolite SKN 183 II
6mm Coolite SKN 176 II
6mm Coolite SKN 175 II
6mm Coolite SKN 165 II
6mm Coolite SKN 154 II
6mm Coolite SKN 144 II
Light %
Transmittance
0.70
0.61
0.47
0.75
0.70
0.70
0.61
0.52
0.42
Reflectance
0.11
0.11
0.16
0.12
0.13
0.14
0.16
0.18
0.20
Solar Radiant Heat %
Direct
0.31
0.27
0.19
0.38
0.35
0.33
0.32
0.26
0.20
Reflectance
0.36
0.32
0.35
0.34
0.32
0.37
0.34
0.30
0.31
Absorption
NS
NS
NS
NS
NS
NS
NS
NS
NS
G-Value
0.33
0.29
0.21
0.40
0.37
0.35
0.34
0.28
0.23
Shading Coefficient %
Short Wavelength
NS
NS
NS
NS
NS
NS
NS
NS
NS
Long Wavelength
NS
NS
NS
NS
NS
NS
NS
NS
NS
Total Transmission
NS
NS
NS
NS
NS
NS
NS
NS
NS

The table above shows performance data relating to high performance neutral solar control glasses available on the market with normal lead-in times

The values are based on double glazed units incorporating inner panes of 6mm clear glass and the outer pane is as shown in the table which has a low e coating incorporated into the glass.

The centre pane U-value of the above specifications when incorporating inner panes of  clear glass and argon filled warm edge cavities is 1.0 W/m²K.

These glasses are popular due to high light transmission values combined with a neutral tint rather than the body tinted coloured glasses available.

Performance Data

Pilkington Suncool High Performance Outer Panes

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Product Description
6mm 70/40
*6mm 70/35
6mm 66/33
6mm 60/31
6mm 50/30 (Silver)
6mm 50/25
6mm 40/22
6mm 30/16
Light %
Transmittance
0.73
0.70
0.66
0.60
0.50
0.50
0.40
0.29
Reflectance
0.10
0.16
0.16
0.11
0.40
0.18
0.20
0.26
Solar Radiant Heat %
Direct
0.40
0.34
0.33
0.29
0.29
0.24
0.20
0.16
Reflectance
0.31
0.35
0.34
0.32
0.47
0.32
0.34
0.37
Absorption
0.29
0.31
0.33
0.39
0.24
0.44
0.46
0.47
G-Value
0.43
0.37
0.36
0.32
0.32
0.27
0.23
0.19
Shading Coefficient %
Short Wavelength
0.46
0.40
0.38
0.34
0.33
0.28
0.23
0.18
Long Wavelength
0.03
0.03
0.03
0.03
0.04
0.03
0.03
0.04
Total Transmission
0.49
0.43
0.41
0.37
0.37
0.31
0.26
0.22

The table above shows performance data relating to Pilkington High Performance Neutral Solar Control glasses.

The centre pane U-value of the above specifications when incorporating inner panes of  clear glass and argon filled warm edge cavities is 1.0 W/m²K.

The Suncool range is available in many different formats but is rarely used in roof glazing as the lead-in times for these products are usually unrealistic compared to the Sunguard Super Neutral and Coolite ranges which are readily available in the UK.

Lead-in periods are usually 8 weeks or longer so very careful planning with the programming of the project must be considered to enable these products to be used.

*Suncool 70/35 is now readily available on a short lead-in time.

The values are based on double glazed units incorporating inner panes of 6mm clear glass and the outer pane is as show in the table which has a low e coating incorporated into the glass.

These glasses are desirable due to high light transmission values combined with a neutral tint rather than the body tinted coloured glasses available.  Suncool is also available with a range of coloured coatings for aesthetic purposes.