Astm C920 !exclusive! Here

Class 12.5 sealants are often sold as "moderately priced" or "multi-purpose" caulks. They are fine for small cracks or interior trim, but they are unsuitable for dynamic building joints. Always verify the Class number on the Data Sheet; if it doesn't list a Class (e.g., Class 25), it likely does not meet the high-movement requirements of C920.

In the complex world of construction specifications, few documents are referenced as frequently—or as misunderstood—as . Whether you are sealing a high-rise curtain wall, a parking deck, or a bathroom expansion joint, this standard serves as the benchmark for quality. astm c920

ASTM C920 is more than a set of laboratory tests; it is a legal and technical contract between manufacturer, specifier, and builder. Officially titled Standard Specification for Elastomeric Joint Sealants , this document establishes the minimum performance requirements for cold-applied, single- or multi-component sealants designed for moving joints in building construction. Unlike general-purpose caulks, a sealant meeting C920 must prove its ability to withstand cyclical movement, extreme temperatures, and long-term weathering without cohesive failure (cracking within the sealant itself) or adhesive failure (peeling away from the joint surface). Class 12

: For joints exposed to pedestrian or vehicular traffic. In the complex world of construction specifications, few

: Often referred to as "self-leveling," these are designed for horizontal joints like sidewalks or driveways.