What is ‘Low-E’ glass?
The term ‘Low-E’ is a shortening of ‘low emissivity’. ‘Low-E glass’ therefore refers to glass with a low-emissivity coating. This low-emissivity coating reduces heat gain or loss by reflecting long-wave infrared radiation (heat) and therefore, decreases the U-value and solar factor and in doing so, improves the thermal insulation of the glazing. Because of its relative neutrality in appearance and energy efficiency, glass with ‘Low-E’ properties is widely used in residential and commercial buildings and is expected to continue to increase in usage in the coming years.
Is all ‘Low-E’ glass the same?
‘Low-E’ glass is mainly manufactured by vacuum deposition (sputter coating). This production method applies various metals, metal oxides or other materials to the glass in an off-line process which takes place within a large vacuum chamber. Sputter coatings are offered in a wide variety of colour and performance options, including post-temperable versions, and can meet and exceed energy code requirements.
How many types of ‘Low-E’ glass are on the market?
The term ‘’Low-E’ glass’ can be used to describe any coating with a low emissivity, however it is more commonly used to refer to only those coatings whose main purpose is thermal insulation, such as Guardian’s ClimaGuard range. But in the wider sense, Guardian Industries offers many different low emissivity coatings which can be found in both the ClimaGuard and SunGuard ranges. These post-temperable sputter coatings are manufactured at multiple locations in the U.S. and Europe.