This standard does not cover structural glazing sealants (see ASTM C1184) or fire-rated sealants (see ASTM C919). It also does not guarantee compatibility with all substrates or primers.
Scope: ASTM C920 establishes the minimum performance requirements for cold-applied, elastomeric joint sealants used in building and civil engineering applications (e.g., curtain walls, pavement joints, window perimeters). This standard does not cover structural glazing sealants
Architects and specifiers rely on ASTM C920 to ensure that a sealant will accommodate expected building movement, adhere to common substrates (concrete, glass, aluminum, etc.), and maintain a weathertight seal over a typical service life of 5–20 years, depending on the application. adhere to common substrates (concrete