Standard Active Last Updated: Jan 17, 2022
ASTM C661-15(2022)

Standard Test Method for Indentation Hardness of Elastomeric-Type Sealants by Means of a Durometer

Significance and Use

4.1 The results obtained by this test method are simply a measure of the indentation into the sealant material of the indentor under load; they are not generally considered a measure of abrasion or wear resistance of the sealant.


1.1 This test method describes a laboratory procedure for determining indentation hardness of joint sealing compounds (single- and multicomponent) intended for use in building construction.

1.2 The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only.

1.3 The committee with jurisdiction over this standard is not aware of any comparable standards published by other organizations.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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Book of Standards Volume: 04.07
Developed by Subcommittee: C24.20
Pages: 3
DOI: 10.1520/C0661-15R22
ICS Code: 83.060; 91.100.50