Glass Performance Data
How to read this table
Each row is one insulating glass unit. Config lists the glass from outdoors to indoors, one code per pane. Surfaces are numbered from the outside in, so a coating on the first pane is on surface 2 and i89 is always on the room-side surface (4 in double-pane, 6 in triple-pane).
- Values are center of glass calculated using LBNL Window 7 per NFRC100 conditions.
- Argon fill is 90% and air fill is 100%.
- Actual values may vary due to production tolerances.
- This performance data is not a commitment for Cardinal to produce.
Definitions: Glossary
Visible light transmittance: the percentage of visible light that passes through the glass.
Percentage of visible light reflected from the outdoor side of the glass.
Percentage of visible light reflected from the indoor side of the glass.
Percentage of ultraviolet light that passes through the glass.
ISO-CIE damage-weighted transmittance (300–700 nm). Estimates fading potential from UV and visible light. Lower means less fading.
Two measures of fading potential: UV transmission and Tdw-ISO.
Solar heat gain coefficient: the fraction of solar radiation that enters as heat, from 0 to 1. Lower means less solar heat.
Light-to-solar-gain ratio: VT divided by SHGC. Higher means more light for the same solar heat.
Rate of heat loss through the glass under NFRC 100 winter conditions. Lower insulates better.
U-factor under NFRC 100 summer conditions (hot, sunny day). Lower insulates better.
Gas filling the space between panes: 100% air or 90% argon.
| Product | Visible Light (%) | Fade Trans (%) | Solar | U-Factor (Btu/h·ft²·°F) | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Panes | Config | Airspace (mm) | Vis Light Trans | Ext Refl | Int Refl | UV | Tdw-ISO | SHGC | Air | Argon |
| Product | Visible Light (%) | Fade Trans (%) | LSG Ratio | Solar | U-Factor (Btu/h·ft²·°F) | U-Summer (Btu/h·ft²·°F) | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Panes | Config | Airspace (mm) | Vis Light Trans | Ext Refl | Int Refl | UV | Tdw-ISO | LSG Ratio | SHGC | Air | Argon | Air | Argon |