Standard Active Last Updated: Oct 24, 2019
ASTM E2786-10(2019)

Standard Test Methods for Measuring Expansion of Intumescent Materials Used in Firestop and Joint Systems

Significance and Use

5.1 These test methods are intended to measure the material’s expansion after heating.

5.2 The test methods also provide a means to determine the expansion factor.


1.1 These test methods determine, by measurement, the expansion of intumescent materials used in firestop and joint systems under specified conditions.

1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

1.3 The text of these test methods references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the fire test response standard.

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: 04.12
Developed by Subcommittee: E06.21
Pages: 7
DOI: 10.1520/E2786-10R19
ICS Code: 13.220.20