Low-E Glass

Low-E glass, or low-emissivity glass, is a type of energy-efficient glass designed to prevent heat escaping through your windows to the cold outdoors. It uses a virtually invisible coating of metal oxide on one of the internal panes of glass – next to the gap filled with inert gas – to keep the heat in.

Here’s how it works:

  1. Heat Reflection: The thin coating on the Low-E glass reflects back a significant portion of the heat generated inside the room back into the space, keeping it warmer.
  2. Solar Gain: Low-E glass allows the sun’s energy to pass through the glass from outside and get absorbed into the room, creating what’s known as passive solar heat gain.
  3. UV and Infrared Blocking: The coating also helps in blocking harmful UV rays and infrared light. UV can cause fading in fabrics and furnishings, while excessive infrared can add unwanted heat to a space.
  4. Types of Low-E Coatings: There are two main types of Low-E coatings:
    • Hard-Coat Low-E (or Pyrolytic coating): This coating is applied while the glass is still in a semi-molten state. It’s more durable and less susceptible to damage, but it is less effective in terms of insulation compared to the soft-coat.
    • Soft-Coat Low-E (or Sputtered coating): This involves applying multiple layers of silver between layers of metal oxide in a vacuum chamber. Soft-coat Low-E provides better insulating performance but is more sensitive and prone to damage if exposed, so it is usually used in double-glazed windows.

By improving thermal insulation, Low-E glass can significantly reduce energy costs associated with heating or cooling a space, making it a popular choice for both residential and commercial buildings.


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