Astm C920 Standard Specification For Elastomeric Joint Sealants Summary Direct

Samples are exposed to intense UV rays and heat to ensure they don't crack, chalk, or lose elasticity over time.

Manufacturers must designate sealants using this four-part system to specify exactly where and how a product should be used: : Indicates the number of components. Samples are exposed to intense UV rays and

Confirms the sealant won't "bleed" oils that could stain porous surfaces like white marble or limestone. Why It Matters Samples are exposed to intense UV rays and