CARDINAL CG COMPANY
Enhanced Winter
Performance Glass
Maximum Heat Control
for Winter
LoĒ-i89™ is our energy-saving 4th surface coated glass. It offers excellent visible light transmittance and low reflectance. Yet it delivers a center-of-glass U-factor of just 0.20 when coupled with our LoĒ³ or LoĒ² glass and argon fill in a 2-pane unit.
Even without argon and with or without capillary tubes, the unit still delivers a U-factor of just 0.23 – perfect for high altitudes.
When regular LoĒ coated windows include room-side LoĒ-i89, more windows can meet the strict ENERGY STAR 7.0 requirements.
What’s more, LoĒ-i89 is easy to clean. It’s as scratch resistant as regular annealed glass. And there’s no haze to mar the view. That’s LoĒ-i89, our enhanced winter performance glass.
Double-pane windows become
triple-pane performers.
With LoĒ-i89, you have more options. There’s less need to go to triple-pane windows to meet the various energy-saving guidelines. No need to invest in redesigning your windows and altering your manufacturing processes either. A double-pane IG unit with LoĒ-i89 can meet the guidelines for most climate zones.
LoĒ-i89 is sputtered onto the indoor lite, the #4 surface, thus reflecting escaping heat back into the room and lowering U-factors.
Coupled with our LoĒ² or LoĒ³ glass and argon fill, this double-pane unit delivers performance much better than clear triple-pane – a center of glass U-factor of just 0.20 compared to 0.37 with clear triple-pane.
To surpass the U-factor performance of our LoĒ-i89 double-pane unit, you would need to go to a triple-pane unit with a low-E coating in each gap. But for maximum thermal control, a triple-pane IG with LoĒ-i89 on the #6 surface provides unmatched performance.
Heat is reflected, not lost.
Ordinary
Clear Glass
The advantages are
more than clear.
In addition to providing maximum energy efficiency in a double-pane unit, LoĒ-i89 offers several other customer-pleasing benefits.
Its surface is smooth and scratch resistant, making it easier to remove label residue and clean. And perhaps most importantly, there’s no haze to mar the view.
Rather than absorbing internal heat, LoĒ-i89 reflects it back into the room, making your living space feel warmer and more comfortable.
LoĒ-i89 and Interior Condensation
High relative humidity (RH) in a home can cause condensation on interior glass surfaces, with outdoor ambient temperature and indoor room temperature also playing a role. LoĒ-i89, which reflects interior heat, can make the room-side glass surface cooler and increase condensation risk during winter.
To prevent condensation, the U.S. ENERGY STAR program advises maintaining 30-40% relative humidity in colder climates. LoĒ-i89 is always paired with a regular LoĒ coating, and delivers glass temperatures high enough to resist indoor condensation.
Warmer Glass Reduces Condensation Occurrence
- 30%
- 40%
-
Glass Temperature
Based on NFRC winter conditions
% RH where condensation forms
-
56.2°
LoĒ³-366
62%
-
47.7°
LoĒ³-366 + i89
45%
-
55.2°
LoĒ-180
60%
-
46.4°
LoĒ-180 + i89
43%
Glass Performance
2 Pane 3/4” with LoĒ-i89
| IG Type and Coating | |
|---|---|
|
LoĒ-180 + i89 |
|
|
LoĒ²-272 + i89 |
|
|
LoĒ²-270 + i89 |
|
|
LoĒ³-366 + i89 |
Visible Light
| Transm- ittance | External Reflectance | Internal Reflectance | |
|---|---|---|---|
|
77% |
15% |
14% |
|
|
70% |
11% |
11% |
|
|
68% |
12% |
13% |
|
|
63% |
11% |
12% |
Fade Transmission
| UV | ISO | |
|---|---|---|
|
27% |
61% |
|
|
16% |
53% |
|
|
14% |
50% |
|
|
5% |
42% |
Solar
| Heat Gain Coefficient | |
|---|---|
|
0.62 |
|
|
0.41 |
|
|
0.36 |
|
|
0.27 |
U-Factor :
- IP
- SI
- IP
- SI
|
Air Fill |
Argon Fill |
|||
|---|---|---|---|---|
|
0.24 |
1.37 |
0.21 |
0.19 |
|
|
0.23 |
1.33 |
0.20 |
1.15 |
|
|
0.23 |
1.32 |
0.20 |
1.14 |
|
|
0.23 |
1.30 |
0.20 |
1.11 |
3 pane 7/8” with LoĒ-i89
| IG Type and Coating | |
|---|---|
|
LoĒ-180, LoĒ-180 + i89 |
|
|
LoĒ²-272, LoĒ-180 + i89 |
|
|
LoĒ²-270, LoĒ-180 + i89 |
|
|
LoĒ³-366, LoĒ-180 + i89 |
Visible Light
| Transm- ittance | External Reflectance | Internal Reflectance | |
|---|---|---|---|
|
68% |
21% |
19% |
|
|
62% |
15% |
16% |
|
|
60% |
16% |
18% |
|
|
56% |
15% |
17% |
Fade Transmission
| UV | ISO | |
|---|---|---|
|
13% |
49% |
|
|
8% |
43% |
|
|
6% |
41% |
|
|
2% |
35% |
Solar
| Heat Gain Coefficient | |
|---|---|
|
0.53 |
|
|
0.36 |
|
|
0.32 |
|
|
0.24 |
U-Factor :
- IP
- SI
- IP
- SI
|
Air Fill |
Argon Fill |
|||
|---|---|---|---|---|
|
0.21 |
1.21 |
0.17 |
0.98 |
|
|
0.21 |
1.20 |
0.17 |
0.97 |
|
|
0.21 |
1.19 |
0.17 |
0.97 |
|
|
0.21 |
1.19 |
0.17 |
0.96 |
Note:
All values calculated using Window 7.8. Emittance of ordinary (pyrolitic) low-E is 0.16.
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 gain.
Fading Transmission:
The UV Transmittance is determined as an average for wavelengths 300 -380 nm. ISO is the weighted average for wavelengths 300 – 700 nm (based on CIE 89/3). This region includes all of the ultraviolet energy and part 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.
U-Factor:
This represents the heat flow rate through a window expressed in IP (BTU/hr·ft²·°F) and SI (W/m2K), using winter night weather conditions of 0°F outside and 70°F inside. The smaller the number, the better the window system is at reducing heat loss.
LoĒ-i89: a new
low for window U-factors.
LoĒ-i89 on the 4th surface of your windows allows you to get near triple-pane performance in a double-pane unit and meet the toughest energy guidelines as well. Finally, LoĒ-i89 can be purchased in tempered or laminated glass and in a variety of shapes and sizes.
To learn more about LoĒ-i89 and other Cardinal glass products, ask your contractor, builder, or architect.
Additional Resources
LoĒ-i89 GLASS SELL SHEET
