Standard Active Last Updated: May 11, 2022 Track Document
ASTM B968/B968M-16(2022)

Standard Test Method for Flattening of Copper and Copper-Alloy Pipe and Tube

Standard Test Method for Flattening of Copper and Copper-Alloy Pipe and Tube B0968_B0968M-16R22 ASTM|B0968_B0968M-16R22|en-US Standard Test Method for Flattening of Copper and Copper-Alloy Pipe and Tube Standard new BOS Vol. 02.01 Committee B05
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Significance and Use

5.1 When properly performed and interpreted, the flattening test will provide information about the relative ductility of a tube and presence of surface defects. For welded tube products, the test will provide information on the integrity of the weld seam.

5.2 In certain product specifications which establish requirements for tubes of sizes greater than 4 in. [100 mm], the test may be allowed as a substitute to the expansion pin test in Test Method B153.


1.1 This test method establishes the requirements for the flattening test for copper and copper alloy pipe and tube of all sizes. The method addresses both inch-pound and metric considerations, and both seamless and welded product.

1.2 Units—The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, SI units are shown in brackets. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.

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: 02.01
Developed by Subcommittee: B05.06
Pages: 3
DOI: 10.1520/B0968_B0968M-16R22
ICS Code: 77.150.30