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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 insulating glass units without the need to construct and measure them. 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.
    • 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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