I’ve heard that argon gas leaks out in the first year. Is this true?

There are many types of spacer systems between glass panes, and each type has different performance properties as it relates to gas retention. We utilize the Intercept Spacer System, which provides unparalleled gas retention, with a loss of less than .1% per year. This means that after 10 years, less than 1% of the gas will have escaped, per testing from the prestigious Rosenheim test performed by the Window Technology Institute (RAL) of Rosenheim, Germany.