Glass Glossary

Silicone Sealant


Last Updated: November 23, 2023

Silicone sealants play an integral role in the construction and longevity of insulating glass units (IGUs). Acting as a secondary seal, silicone ensures the highest level of structural rigidity and insulation of the unit. Cardinal’s Endur® IG and XL Edge® IG utilizes silicone as the secondary sealant of their dual-seal construction.

Characteristics and benefits of silicone sealant

Adhesive Strength: Silicone sealants offer excellent adhesion, ensuring a robust bond that ties the IG components together.

Durability: Notably resistant to degradation from UV radiation, extreme temperatures, and weathering, silicone sealants ensure the seal remains intact, preserving the IGU’s performance.

Thermal Stability and Low Conductivity: Beyond its ability to withstand a broad temperature range, silicone’s low thermal conductivity ensures minimal heat transfer, enhancing the IGU’s overall insulative properties.

Moisture Resistance: Highly resistant to moisture intrusion, silicone prevents internal condensation, ensuring the IGU’s insulative properties remain intact.

Compatibility: Compatible with all the materials used in Cardinal’s IG units, silicone sealants are paramount for the unit’s longevity and optimal performance.