What is the function of a spacer in insulated glass units (IGUs)?

The function of a spacer in insulated glass units (IGUs) is primarily to maintain separation between the glass panes. In an IGU, multiple panes of glass are sealed together within a frame, and the spacer plays a critical role in ensuring an optimal gap between the panes. This separation is vital for several reasons.

One important aspect is that it allows for the inclusion of a desiccant in the spacer, which helps to absorb moisture from the air trapped between the glass panes, preventing condensation and improving the performance of the unit. Furthermore, maintaining the correct distance between the glass layers contributes to thermal insulation and energy efficiency by creating an insulating air space, which minimizes heat transfer.

While contributors to aesthetics, sound insulation, and structural support can be relevant factors in the broader context of IGUs, the primary role of the spacer is unequivocally to create and maintain the necessary separation between the glass panes. This function is essential for the overall performance and durability of the insulated glass unit.