Windows That Last Longer 20 years of incredible durability and insulation Cardinal IG Sealed Glass Technology is one of the best design and fabrication on the market. This technology incorporates a stainless-steel spacer with airtight bent corners and the dual-seal construction of compressed polyisobutylene (PIB) and silicone. This means that the spacer contains a chemical and material composition which eliminates the potential for any moisture accumulation within the window. In addition, argon filled IG units improve the window’s heat loss or insulation capacity. This technology essentially guarantees a 0.2% seal failure rate over the course of 20 years! To compare, most windows have a standard failure rate of about 9% in 15 years. Modern spacer systems simply cannot match the long-term durability and advantages of Cardinal technology, and cannot match the energy benefits that this window technology offers.