SUNGATE® 460

Passive Low-E Glass

Lock in the warmth, all winter long.

Sungate® 460 Passive Low-E Glass

The latest advance in energy-efficient window glass, Sungate® 460 passive low-e glass keeps your home toasty in the winter and heating bills under wraps, too. Clear and neutrally reflective, Sungate® 460 glass transmits solar energy into your residence then traps it with furnace heat to create warm, comfortable and energy-efficient living spaces.

Designed for northern climates, Sungate® 460 glass has an exceptional center-of-glass winter nighttime U-value of 0.26 in a standard, ¾-inch double-pane insulating glass unit (IGU), more than twice the insulating power of the same double-pane unit made with clear glass.

When supplemented with quality framing and insulating spacers and gases, the center-of-glass performance of Sungate® 460 glass can facilitate overall window U-values of 0.30 and minimum SHGCs of 0.42 in double-pane window units, which qualifies windows for certification under the ENERGY STAR 6.0 standard.

Sungate® 460 glass has high visible light transmittance of 75 percent, which enables it to flood interiors with light and to achieve a clear glass appearance that harmonizes well with building materials such as brick, stone, wood and metal siding.

To learn more about Sungate® 460 glass and how it can help residential windows meet ENERGY STAR® performance standards for your area, click here to find a window dealer near you.

Glass Comparison

Sungate® 460 double glazed insulating glass unit vs. standard clear double insulating glass unit
Solar Heat Gain Coefficient
Visible Light
Ultraviolet Energy
Winter Furnace Heat

Double-Glazed IGU Comparison (¾" window thickness with 3mm glass)

COG (Center-of-Glass) Measures Double-Glazed IGU with Clear Glass Sungate® 460 (3) Double-Glazed IGU Benefits
Solar Heat Gain Coefficient 0.75 0.57 Transmits 24% less solar energy to keep homes cooler in the summer
Visible Light Transmittance 81% 75% High visible light transmittance, comparable to conventional clear glass
U-Value 0.48 0.26 Insulates 46% better than a standard clear insulating glass unit
Ultraviolet Energy 58% 17% Reduces fabric-fading UV energy three times more effectively than clear glass
       
Damage Weighted Transmittance * 0.74 0.56 Minimizes potential for fading damage by 55 percent compared to clear glass

Triple-Glazed IGU Comparison (1¼" window thickness with 3mm glass)

COG (Center-of-Glass) Measures Triple-Glazed IGU
Clear Glass
Sungate® 460 (3)
Triple-Glazed IGU
Sungate® 460 (3)/(5)
Triple-Glazed IGU
Benefits
Solar Heat Gain Coefficient 0.68 0.51 0.47 Transmits up to 31% less solar energy to keep homes cooler in the summer
Visible Light Transmittance 74% 68% 62% High visible light transmittance, comparable to conventional clear glass
U-Value 0.31 0.18 0.13 Insulates 46% better than a standard clear insulating glass unit
Ultraviolet Energy 48% 14% 5% Reduces fabric-fading UV energy 90% more effectively than clear glass
       
Damage Weighted Transmittance * 0.66 0.51 0.42 Minimizes potential for fading damage by 64 percent compared to clear glass
*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® 460 glass can minimize fading damage across the entire solar spectrum more effectively than glass designed primarily to block UV light.

All comparisons are center of glass based on an insulating unit containing 3/4" insulating units; two 1/8" (3mm) glass lites and a 1/2" (12mm) air-filled space for the standard clear insulating glass and 90% argon gas-filled space for the Sungate® 460 insulating glass. Actual glass performance may differ due to glass thickness, gas fill and glass to frame ratio.
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