Glass Properties

The charts on the pages in this section outline the properties of the various glass in Walshs extensive range. Below is information to help you understand the charts.

Product Name For more information on individual products ask your Walshs Sales Consultant.

Nominal Thickness identifies the glass thickness

Visible Light Transmission is the percentage of visible light that passes directly through the glass. The higher the percentage, the more daylight gets through.

Visible Light Reflection is the percentage of visible light reflected toward the exterior.

Solar Transmission is the percentage of normal incident visible light and solar energy that passes directly through the glazing.

Solar Reflection is the percentage of normal incident visible light and solar energy reflected toward the exterior.

UV Transmission is the percentage of UV light transmitted measured in the light range of wave lengths shorter than 380 nanometres. A lower number is better.

U Value is the measure of the rate of heat gain or loss through glazing caused by environmental differences between indoor and outdoor air. The lower the value the better the insulation.

Shading Coefficient is the ratio of solar heat gain through glass relative to that through 3mm clear glass. A lower number indicates a better performance.

SHGC (Solar Heat Gain Coefficient) is the proportion of total solar radiation that is transferred through glass in normal circumstances. A lower number indicates a better performance.

Hard Coating is a metal oxide gas deposited as the glass exits the oven. The glass can then be processed and toughened after manufacture.

Soft Coating is a non magnetic alloy applied to float glass after manufacture. Glass with soft coating can only be toughened prior to the soft coating being applied.

Please note: Performance data is based on standard summer conditions.