The Fenestration and Glazing Industry Alliance (FGIA) has released an updated version of its technical manual addressing box spacer systems used in insulating glass units (IGUs), marking the first revision of the document since 1982. The publication, titled IGMA TM-2000-26: Test Methods and Quality Assurance Criteria for Box Spacers Used for Insulating Glass Units, is now available through the FGIA online store.

This updated manual provides comprehensive guidance on the performance, testing and quality assurance of box spacer constructions, critical components positioned at the edges of IGUs. These spacers, typically manufactured from metal, plastic or hybrid materials, play a key role in maintaining the separation between glass panes while supporting sealant application and housing desiccants to control internal moisture.

According to FGIA Glass Products Specialist Amy Becker, the document outlines standardized methods for evaluating important characteristics such as sealant compatibility, airflow performance, compression behavior and overall workmanship. These criteria are essential for ensuring that spacers effectively support primary edge seals designed to limit moisture vapor transmission and argon gas loss within the unit.

By updating this long-standing technical resource, FGIA aims to align industry practices with modern materials, technologies and performance expectations. The revised manual serves as a valuable reference for manufacturers, suppliers and quality assurance professionals involved in IGU production.