The rate of heat transfer across an IG unit is measured using "U" and "R" values.
U-Value = Coefficient of heat transfer (BTU / Hour / Foot2 / °)
R-Value = Coefficient of Thermal Resistance (1/U)
The U-Value is a measure of an IG's ability to block heat transfer - lower values of U indicate better insulating performance, and equate to higher R values.
Below are just a few examples of U and R values with various glass make-ups using 1/8" glass and 1/2" airspace where applicable:
|Double Pane IG||.49||2.04|
|Double Pane with lowE||.36||2.78|
|Pane IG Triple||.32||3.13|
Let our Technical Services Department help you determine the best unit construction to make your units "green":
Email: Email Thermoseal