Argon gas is most commonly used in the ordinary incandescent lightbulb. It is clear, non toxic, and non flammable. The space between the two panes of glass is filled with Argon gas, because thermal conductivity of this inert gas is lower than air. Result? Heat loss is reduced and energy efficiency is improved. When considering the Argon gas option, ensure your supplier is selling you a window which has been tested and is capable of retaining the gas once installed. A window that leaks Argon will take away both the thermal and monetary value of your investment. Swiggle seal is the only Warm Edge insulating glass system to pass the DIN standard for Argon gas retention in North America today. To learn about our Low E Glass, click here. To learn about our Swiggle Seal Technology, click here.