Low-E Glass
Year-Round Comfort
ROBOVER uses Sungate® 400 Low-E glass to manufacture insulating glass units because it strikes the perfect balance between energy efficiency and interior comfort in cooler climates.
Robover uses Sungate® 400 Low-E glass to manufacture insulating glass units because it strikes the perfect balance between energy efficiency and interior comfort in cooler climates. Windows made with Sungate® 400 Low-E glass enhance your comfort in more ways than one, keeping you warmer on chilly winter nights and cooler during the hottest days of summer. What’s more, it provides the benefits of natural light while reducing energy costs.
To find out more about how our glass boosts energy efficiency and saves you money:
PPG’s Sungate® 400 Low-E leaflet.
Thermal Resistance
The R-value is a measure of thermal resistance that indicates insulation performance. The higher the value, the more effectively heat and cold are blocked.
Solar Gain
The solar heat gain coefficient of an insulating glass unit made with Sungate 400® Low-E glass is only 10% less than an insulating glass unit made with clear glass. The special coat of the Sungate® 400 Low-E glass makes it ideal for cooler climates, retaining heat and lowering heating costs.
Visible Light
Sungate® 400 Low-E glass has the look of traditional glass inside and out. An insulating glass unit made with Sungate 400® Low-E glass transmits about 97% of the visible light transmitted by an insulating glass unit made with clear glass.
INSULATING GLASS UNIT PERFORMANCE DATA
3mm glass and 12.7mm InterceptMD spacer
| R Factor | Solar gain | Transmitted light | |
| DOUBLE GLASS UNIT | |||
| 2 clear glass lights + air | 2.0 | 0.75 | 81% |
| 1 clear and 1 Low-E glass lights + arg on | 3.6 | 0.68 | 79% |
| TRIPLE GLASS UNIT | |||
| 3 clear glass lights + air | 3.1 | 0.67 | 74% |
| 2 clear and 1 Low-E glass lights + argon | 5.3 | 0.61 | 71% |
| 1 clear and 2 Low-E glass lights + argon | 6.9 | 0.55 | 69% |
