Work Item
ASTM WK71521

Revision of C920-18 Standard Specification for Elastomeric Joint Sealants


None Provided


Update the standard to include an option to specify products that meet ASTM C1248 - Standard Test Method for Staining of Porous Substrate by Joint Sealants. ASTM C920 currently specifies the sealant shall not cause any stain to a white mortar cement base when tested in accordance with C510 Standard Test Method for Staining and Color Change of Single- and Multicomponent- Joint Sealants. C510 is a relatively short test used by manufacturers to evaluate staining and color change under accelerated weathering conditions without compression of the sealant specimen. ASTM C1248 is a test method used to evaluate staining of porous substrates with the samples placed into compression under accelerated weathering conditions over a longer period of time.


Developed by Subcommittee: C24.10

Committee: C24

Staff Manager: David Lee

Work Item Status

Date Initiated: 01-21-2020

Technical Contact: Michael Nagle

Item: 002

Ballot: C24.10 (20-02)

Status: Will Reballot Item