The perimeter sealing system that joins the lites and spacer of an insulating glass unit and limits moisture or gas exchange while maintaining the cavity.
GlassRenu · Educational illustration
Meaning and boundaries
The edge seal is a system that may contain primary and secondary seals; it is not identical to the field glazing sealant around the installed unit.
Why it matters in glass restoration
Damage, heat, solvent, incompatibility, or abrasion near the perimeter can contribute to loss of unit durability or structural function.
Related terms
References
- National Glass Association — GANA Glazing Manual, 2022 edition
Publisher’s original source - ASTM International — C1369 — Secondary Edge Sealants for Structurally Glazed IGUs
Publisher’s original source - ASTM International — E2190 — Insulating Glass Unit Performance and Evaluation
Publisher’s original source - National Glass Association and FGIA — Compatibility Testing of IG PIB Primary Sealant with Respect to Glazing Materials
Publisher’s original source