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ASTM D2240-15

Historical Revision

Standard Test Method for Rubber Property—Durometer Hardness

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1.1 This test method covers twelve types of rubber hardness measurement devices known as durometers: Types A, B, C, D, DO, E, M, O, OO, OOO, OOO-S, and R. The procedure for determining indentation hardness of substances classified as thermoplastic elastomers, vulcanized (thermoset) rubber, elastomeric materials, cellular materials, gel-like materials, and some plastics is also described.

1.2 This test method is not equivalent to other indentation hardness methods and instrument types, specifically those described in Test Method D1415.

1.3 This test method is not applicable to the testing of coated fabrics.

1.4 All materials, instruments, or equipment used for the determination of mass, force, or dimension shall have traceability to the National Institute for Standards and Technology, or other internationally recognized organizations parallel in nature.

1.5 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only. Many of the stated dimensions in SI are direct conversions from the U. S. Customary System to accommodate the instrumentation, practices, and procedures that existed prior to the Metric Conversion Act of 1975.

1.6 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 and health practices and determine the applicability of regulatory limitations prior to use.


4.1 This test method is based on the penetration of a specific type of indentor when forced into the material under specified conditions. The indentation hardness is inversely related to the penetration and is dependent on the elastic modulus and viscoelastic behavior of the material. The geometry of the indentor and the applied force influence the measurements such that no simple relationship exists between the measurements obtained with one type of durometer and those obtained with another type of durometer or other instruments used for measuring hardness. This test method is an empirical test intended primarily for control purposes. No simple relationship exists between indentation hardness determined by this test method and any fundamental property of the material tested. For specification purposes, it is recommended that Test Method D785 be used for materials other than those described in 1.1.

SDO ASTM: ASTM International
Document Number D2240
Publication Date Aug. 1, 2015
Language en - English
Page Count 13
Revision Level 15
Supercedes
Committee D11.10
Publish Date Document Id Type View
Aug. 1, 2015 D2240-15E01 Revision
Aug. 1, 2015 D2240-15 Revision
Aug. 15, 2005 D2240-05 Revision
July 1, 2004 D2240-04E01 Revision
July 1, 2004 D2240-04 Revision
May 10, 2003 D2240-03 Revision
Dec. 10, 2002 D2240-02B Revision
Aug. 10, 2002 D2240-02A Revision
Jan. 10, 2002 D2240-02 Revision
Jan. 10, 2002 D2240-00 Revision
June 15, 2021 D2240-15R21 Reaffirmation
Jan. 1, 2010 D2240-05R10 Reaffirmation