Technical Information

Glass performance data

Energy terms & data conditions

Visible Light Transmittance
The percentage of visible light (380-780nm) that is transmitted through the glass.

Solar Transmittance
The percentage of ultraviolet, visible and near infrared energy (300-3000nm) that is transmitted through the glass.

Visible Light Reflectance
The percentage of light that is reflected from the glass surface.

Solar Reflectance
The percentage of solar energy that is reflected from the glass surface

Ashrae U-Value
A measure of heat gain or heat loss through glass due to the differences between indoor and outdoor temperatures. Summer daytime U-Values are based on:
- Outdoor Temperature: 32°C
- Indoor Temperature: 24°C
- Wind Speed: 2.8M/S
- Solar Intensity: 783 W/M2

Shading Coefficient
Shading coefficient is the ratio of solar heat gain through specific glass relative to the solar heat gain through a 3mm thick clear glass. As shading coefficient number decreases, heat gain is reduced, which means a better performance product.

Solar Heat Gain Coefficient
The portion of directly transmitted and absorbed solar energy that enters into the building's interior. The higher the SHGC, the higher the heat gain.

Sound insulation of glass

For today's design professional, selecting the right glass for commercial buildings can be a challenge. Many factors must be taken into account, such as meeting the original design concept, as well as solar, optical and acoustical performance requirements.

Sound transmission through building walls and glass is related to the limp/mass law. Simply stated, the heavier, more flexible the material is, the better it will be at reducing sound transmission.

Acoustical Glass Performance Data


Care, Cleaning, Maintenance Guidelines

Disclaimer: The information contained herewith is presented in good faith. CGT reserves the right to change product specifications and without incurring obligation.


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