Astm C 920 Sealant ~upd~ May 2026

What movement class do you typically specify for curtain wall joints? Let us know below. 👇 #ASTMC920 #BuildingEnvelope #SealantSpecs #ConstructionQuality #FacadeEngineering #ElastomericSealant

Here is what you need to know about the industry’s benchmark for elastomeric joint sealants. Unlike general-purpose caulks (which meet ASTM C834), ASTM C920 is designed for dynamic movement . This standard tests a sealant’s ability to stretch, compress, and recover under real-world conditions. astm c 920 sealant

But not all sealants are created equal. If you are specifying or installing a joint sealant for a critical application (curtain wall, plaza deck, or window perimeter), one standard should be non-negotiable: . What movement class do you typically specify for

When you see that designation, you know you have a product engineered for decades, not just the next rainstorm. or window perimeter)