Passive Low-E Glass

The perfect balance of energy efficiency and interior comfort for cooler climates.

Sungate® 400 Passive Low-E Glass

With its extensive background in multiple glass coating technologies, Vitro Architectural Glass (formerly PPG glass) has the ability to continually refine products to meet the needs of homeowners in a range of climates. Sungate® 400 glass is a superb example of that expertise.

Building on decades of proven technology and performance, Sungate® 400 passive low-e glass is engineered to meet Canadian ENERGY STAR® requirements, as well as the increasingly rigorous demands for energy-efficient windows in northern U.S. climates.

With a winter nighttime U-value of 0.28, Sungate® 400 glass helps homes trap winter furnace heat up to 41% more effectively than standard double-pane insulating glass units fabricated with clear glass. The same coating also cultivates a feeling of warmth and comfort in homes by allowing almost 70% of the sun’s heat energy to pass through, along with nearly 80% of the available daylight.

The benefits of Sungate® 400 glass remain when days get longer and warmer, too. In the spring and summer, Sungate® 400 glass continues to deliver lower energy costs by blocking solar heat and transmitting high levels of sunlight. That not only diminishes demand for air-conditioning, while also cutting the electricity bill for lighting.

For even greater year-round insulating performance, homeowners can insist on windows made with Sungate® 400 glass and Intercept® Warm-Edge Spacers by Vitro glass. With the industry’s highest thermal performance rating, Intercept® spacers deliver the added benefits of reduced heat transfer, less condensation and enhanced durability to protect your window investment for years to come.

Glass Comparison

Sungate® 400 double insulating glass unit vs. standard clear double insulating glass unit
Solar Heat Gain Coefficient
Visible Light
Ultraviolet Energy
Winter Furnace Heat
Standard Insulating Glass Unit Sungate® 400 Insulating Glass Unit Benefits
Solar Heat Gain Coefficient 0.75 0.68 Maintains 68% transmittance of solar heat energy for warmth during winter and reduce cooling energy costs
Visible Light Transmittance 81% 78% Allows high level of visible light transmittance and exterior clear glass appearance
U-Value 0.48 0.28 Insulates as much as 42% better than standard clear insulating glass
Ultraviolet Energy 58% 32% Eliminates 68% of UV transmittance, a common contributor to fabrics, carpet and furniture fading
Damage Weighted Transmittance * 0.74 0.64 Minimizes the total potential for fading damage by 14%
*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® 400 glass can minimize fading damage across the entire solar spectrum more effectively than glass designed primarily to block UV light.
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