Standard Active Last Updated: Oct 04, 2022
ASTM C1338-19(2022)

Standard Test Method for Determining Fungi Resistance of Insulation Materials and Facings

Significance and Use

2.1 The type of materials used in the manufacture of insulation products and the type of membrane used to face these products can sometimes affect fungi sustenance in the presence of high humidity.

2.2 This test method is used to determine the relative ability of an insulation and its facing to resist fungal growth under conditions favorable for their development.

2.3 This test method uses a comparative material to determine the relative ability of a material to resist fungal growth. In some specialized product areas, it is required that no growth take place. In such cases, the use of the comparative material is omitted and the pass/fail criterion is based upon growth.


1.1 This test method covers the determination of the ability of new insulation materials and their facings to resist fungal growth.

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 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.

1.4 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: 04.06
Developed by Subcommittee: C16.31
Pages: 3
DOI: 10.1520/C1338-19R22
ICS Code: 91.100.60