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Optimal Low-E Coating Placment for Double- and Triple-Glazed IGUs

Achieving optimal performance of solar control low-e glass and passive low-e glass requires proper placement of low-e coatings on the glass surfaces of an insulating glass unit (IGU). Placement considerations vary depending on whether the glass is solar control low-e glass or passive low-e glass, and whether the IGU is double- or triple-glazed.

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INSLIP and INSLOP

Placement of a laminated lite within an insulating glass unit (IGU) is key to how its glazing system will perform. INSLIP and INSLOP are two commonly used terms to help designers position laminated glass properly.

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Tdw-ISO: Fading Factors

For years, UV light transmittance used to be thought of as the measure of a glazing material's ability to protect furnishings from fading due to sunlight exposure. Now, ISO Damage Weighted Transmittance, or Tdw-ISO, is considered the most accurate criterion for assessing potential fading damage.

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Short Wave and Long Wave Energy

Understanding the solar energy spectrum is key to understanding glass coatings. Glass coatings affect the way the different parts of the solar spectrum are absorbed into, transmitted through or reflected off of glass, all of which factor into the glass' energy efficiency.

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Heat-Treated Glass: It's All About the Pressure

When designing with large expanses of glass, it is critical to know when the glass may need to be heat-treated for durability and/or safety. The type of processing required—heat strengthening or tempering—depends on the specific application.

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Condensation: What it is. What it means.

Condensation means the IGU is working properly, serving as a thermal barrier between extremes in temperature.

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What Glass Does with Solar Energy

There are three parts to the solar energy spectrum: infrared, visible and ultraviolet. Glass consequently responds to these three different types of light in three different ways: by reflecting, absorbing or transmitting it. Tints and coatings can be used to impact that response in order to improve overall glass performance.

 
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Solar Energy Spectrum

Understanding the solar energy spectrum is the first step in understanding how low-e coatings work.

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Fun Glass Facts

 

The first insulating glass units were developed in 1945 for the Pullman Car Company in Butler, PA.

 

A standard float tank can produce glass 24 hours/7 days a week for up to 15 years before it needs to be rebuilt.