Glass spacers—sometimes simply called spacers—are used in insulating glass units (IGUs) to create a space that physically separates the lites of glass. That space it creates is sometimes filled with inert gases that add to the insulating properties of the IGU. Spacers can be made of different materials (plastic, metals, composites) and depending on the material and the IGU, they play different roles in addition to creating the space. Warm edge spacers create an additional layer to heat loss through the windows; some spacers may help absorb moisture.

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