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  • Double Glazing Units g value guide
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    Double Glazing Units - g-value guide

    The g-values and colour/tint of our main Double Glazing Unit Products are summarised in the table below:


    g-value Colour / Tint Product (6 mm panes)
    0.19 Clear/Neutral  Pilkington Suncool™ 30/17
    0.25 Clear/Neutral  Pilkington Suncool™ Q 50
    0.27 Clear/Neutral  Pilkington Suncool™ 50/25
    0.20 - 0.28 ** Blue  Pilkington Activ SunShade™ Blue
    0.28 Blue  Pilkington Suncool™ Blue 50/27
    0.29 - 0.35 * Blue  Pilkington Arctic Blue™
    0.32 Silver   Pilkington Suncool™ Silver 50/30
    0.31 - 0.41 * Grey  Pilkington Optifloat™ Grey  
    0.32 Clear/Neutral  Pilkington Suncool™ 60/31
    0.32 - 0.43 * Bronze  Pilkington Optifloat™Bronze
    0.32 - 0.47 ** Clear/Neutral  Pilkington Activ SunShade™ Neutral
    0.33 - 0.45 ** Blue   Pilkington Activ™ Blue
    0.36 Clear/Neutral  Pilkington Suncool™ 66/33
    0.36 - 0.43 * Green  Pilkington Optifloat™ Green
    0.36 - 0.53 ** Bronze  Pilkington Activ™ Bronze
    0.37 Clear/Neutral  Pilkington Suncool™ 70/35
    0.41 - 0.52 * Clear/Neutral  Pilkington Eclipse Advantage™ Clear
    0.43 Clear/Neutral  Pilkington Suncool™ 70/40

    *Colours for identification purposes only


    Figures based on IGU incorporating 4 mm Pilkington Optifloat™ Clear as inner pane unless otherwise stated.

    * g-value depends on which thermal insulation glass is selected as inner pane.

    ** g-value depends on which thermal insulation glass is selected as inner pane (all based on 4 mm thickness).

    For higher g-values please refer to our Thermal Insulation glass product range.

    For thicknesses other than above calculate using Pilkington Spectrum below:

    Spectrum Calculation Program


    Pilkington Spectrum is a Windows-based glass performance model which enables you to quickly and efficiently calculate key properties of a wide range of single glazing and insulating glass units. Also available as an app for mobile devices, you can use Pilkington Spectrum to provide the following information:

    • Light and solar properties (transmittance, reflectance, absorptance, g value, etc.).
    • Centre pane Ug-value.
    • Sound insulation values.
    • Global Warming Potential (GWP), or carbon footprint.
    • Ultra violet (uv) transmittance and colour rendering index (Ra).
    • Other properties (e.g. pendulum body impact resistance, fire resistance, resistance to manual attack, etc.).
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