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Low-E glass, or low-emissivity glass, is a type of energy-efficient glass that has a special coating designed to reflect infrared light while allowing visible light to pass through. This coating helps to reduce heat transfer, making buildings more energy-efficient by keeping interiors warmer in winter and cooler in summer. Low-E glass is typically made from float glass, which is produced by floating molten glass on top of molten tin to create a smooth and even surface.
| Coating type | Hard coat or soft coat |
| Visible light transmittance | Up to 90% |
| Solar heat gain coefficient | 0.25 to 0.70 |
| U-value | 1.0 to 1.5 W/m²K |
| Thickness | 3 mm to 12 mm |
When selecting Low-E glass, buyers should consider the type of coating (hard or soft), desired visible light transmittance, and solar heat gain coefficient based on the specific climate and application. It is also important to specify the thickness of the glass and any additional treatments or laminations required. Certifications for energy efficiency may also be relevant, so buyers should inquire about compliance with local building codes and standards.
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Hard coat Low-E glass is more durable and suitable for single-pane applications, while soft coat Low-E glass offers better thermal performance and is typically used in insulated glazing.
Yes, Low-E glass can be beneficial in various climates, but the specific type of coating may vary based on local temperature and sunlight conditions.
Yes, Low-E glass generally costs more than standard glass due to its specialized coatings and energy-saving properties.
Low-E glass reflects heat back into the building during winter and blocks solar heat during summer, reducing the need for heating and cooling.
Yes, Low-E glass can be combined with various tints to enhance privacy and reduce glare while maintaining energy efficiency.
With proper care and installation, Low-E glass can last for many years, often matching the lifespan of traditional glass.