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Glass & Glazing Performance

Comfort, energy savings and aesthetics are all important factors to consider when choosing windows. Selecting the best glass type is equally as important as the style of window chosen for a particular location. Lux Windows and Glass Ltd. offers a variety of glazing options to suit any location or climate.

Glazing Performance


As a standard, the space between the panes of glass in a Low E window are filled with argon gas—a clear, harmless gas that provides maximum insulating capabilities.


We have an unlimited number of glazing options available including dual pane, triple pane, custom obscure patterns, reflective surfaces, etc. Your sales representative can assist with glazing configurations to suit your desired requirements.

Endur IG – Insulated glass units engineered to a higher standard

With its unparallel longevity and outstanding thermal performance, Endur IG stands in a class of its own. This warm-edge stainless steel spacer improves sightline temperature and enhances resistance to condensation. The corrugated shape adds strength. Bent corners—no notches or open joints—create a continuous impermeable barrier around the entire perimeter keeping moisture out.

Lux – Double-Pane Units

Consist of two panes of glass with a spacer that separates them, It is required as a standard for all residential applications in Canada due to the harsh winter climate.

  1. Primary Seal
    Polyisobutylene minimizes moisture permeation, is UV resistant and provides an outstanding argon barrier
  2. Secondary Seal
    Specially formulated silicone provides long-term adhesion and structural integrity, is unaffected by UV exposure and provides excellent durability when exposed to moisture
  3. Spacer
    Stainless steel spacer provides maximum area for primary and secondary sealant coverage. It provides increased resistance to condensation and less stress on the seal system. No polymer content eliminates the risk of chemical fogging
  4. Desiccants
    Beaded molecular sieve provides initial frost points below -53°C Desiccant which assures optimum moisture absorption while minimizing the effects of temperature-related pressure changes

Lux – Triple-Pane Units

A significant enhancement from dual with three panes of glass and two spacers between. Triple-pane units offer greater performance when comparing factors such as R-value.

Performance Comparison

ENDUR™ Ig Spacer
U-Factor Argon
R-Value Argon
Solar Heat Gain
Visible Light Transmission
Ultraviolet Light Fading
Ultraviolet Light Transmission
Dual Pane Clear - Clear .48 2.08 .89 .78 82% 75% 58%
Dual Pane LoĒ²-272 #2 - Clear .25 4.00 .89 .41 72% 55% 16%
Dual Pane LoĒ3-366 #2 - LoĒ-i89 (#4) .20 5.00 .31 .27 63% 41% 5%
Triple Pane Clear - Clear - Clear .29 3.45 .81 .71 76% 68% 49%
Triple Pane LoĒ2®-272 #2 - Clear - Clear .19 5.26 .44 .38 66% 50% 14%
Triple Pane LoĒ2®-272 #2 - Clear - LoĒ®-180 #5 .13 7.69 .43 .37 63% 44% 8%
Triple Pane LoĒ2®-272 #2 - LoĒ®-180 #4 - LoĒ-i89 #6 .11 9.09 .41 .36 62% 43% 8%
Triple Pane LoĒ3®-366 #2 - LoĒ®-180 #4 - LoĒ-i89 #6 .11 9.09 .27 .24 56% 35% 2%


This represents the heat flow rate through a window expressed in BTU / hr / ft2 / °F, using winter weather conditions of 0°F outside and 70°F inside. The smaller the number, the better the window system is at reducing heat loss.
Shading coefficient
The measure of the total amount of heat passing through the glazing (known as the total solar heat transmittance) compared with that through a single clear glass. The lower a window's solar heat gain coefficient or shading coefficient, the less solar heat it transmits, and the greater its shading ability.
Fading Transmission
The portion of energy transmitted in a spectral region from 300 to 700 nanometers. This region includes all of the ultraviolet energy and most of the visible spectrum, and will give the best representation of relative fading rates. The lower the number, the better the glass is for reducing fading potential of carpets and interior furnishings.
Designates window resistance to heat flow. The higher the R-Value, the more efficient the window is in reducing winter heating costs. (This number is the inverse of U-Value.)
Solar Heat Gain Coefficient – (SHGC)
The amount of solar radiation that enters a building as heat. The lower the number, the better the glazing is at preventing solar heat gain.