Yes, argon gas sealed inside double-pane or triple-pane insulated windows can slowly leak out over many years, though the process is extremely gradual. High-quality modern windows lose argon at a very low rate, typically estimated at less than 0.5% to 1% per year. However, as the perimeter hermetic seal ages and degrades over two decades, gas leakage accelerates, eventually leading to thermal window failure.
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