Glass Glossary

Edge Deletion


Last Updated: November 23, 2023

Edge deletion is the process of removing the low-E (low-emissivity) coating around the perimeter of a glass pane prior to assembly in an insulating glass (IG) unit. This is typically done to improve the adhesion and sealing of the IG, ensuring a robust and long-lasting seal between the glass panes.

Cardinal Glass takes the essential step of edge deleting all of its glass panes with LoĒ™ coatings (with the exception of LoĒ-i89, a #4/#6 surface coating). By removing the LoĒ coating around the edges, Cardinal ensures that the spacer and sealant materials can form a strong bond directly to the glass surface. This direct glass-to-sealant bond enhances the overall integrity and durability of the IG unit, helping to prevent seal failure, moisture ingress, and gas loss over time.