Passive Low-E Glass

Helps keep homes comfortable year-round while reducing energy costs.

SUNGATE® 500 Passive Low-E Glass

Sungate 500 glass offers proven performance in homes across North America. PPG has shipped over 200 million square feet of Sungate 500 glass to customers in the past decade—enough to cover the floor space of every store in 80 Malls of America.

Sungate 500 glass, formulated with one of the industry’s most enduring passive low-e coatings, provides a nighttime u-value of just 0.31 percent, which means it is 35 percent more effective than ordinary clear glass at preventing furnace heat from escaping through a window.

Glass Comparison

Sungate 500 insulating glass unit vs. standard insulating glass unit
Solar Heat Gain Coefficient
Visible Light
Ultraviolet Energy
Winter Furnace Heat
Standard Insulating Glass Unit Sungate® 500 Insulating Glass Unit Benefits
Solar Heat Gain Coefficient 0.75 0.70 Maintains 70% transmittance of solar heat energy for warmth during winter and reduce cooling energy costs
Visible Light Transmittance 81% 76% Allows high level of visible light transmittance and exterior clear glass appearance
U-Value 0.48 0.31 Insulates as much as 35% better than standard clear insulating glass
Ultraviolet Energy 58% 49% Eliminates 51% of UV transmittance, a common contributor to fabrics, carpet and furniture fading
Damage Weighted Transmittance * 0.74 0.66 Minimizes the total potential for fading damage by 11%
*Damage Weighted Transmittance is calculated according to a function called Tdw-ISO, developed by the International Standards Organization (ISO) and published by the International Commission on Illumination (CIE), the world’s leading technical organization on lighting and illumination. The Tdw-ISO calculation measures fading risk from solar radiation across the entire solar light spectrum, from UV light (280-380 nanometers) through visible light (390-780 nanometers). According to the CIE standard, which is considered more comprehensive than UV rating alone, sungate 500 glass can minimize fading damage across the entire solar spectrum more effectively than glass designed primarily to block UV light.
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