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ASTM D531-15

Standard Test Method for Rubber Property—Pusey and Jones Indentation
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1.1 This test method covers the determination of the indentation of rubber or rubber-like materials by means of the Pusey and Jones type of plastometer. This apparatus is used to measure the depth of indentation of an indentor, under fixed force into the surface of a specimen.

1.2 The values stated in SI units are to be regarded as the 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 and health practices and determine the applicability of regulatory limitations prior to use.

1.1 This test method covers the determination of the indentation of rubber or rubber-like materials by means of the Pusey and Jones type of plastometer. This apparatus is used to measure the depth of indentation of an indentor, under fixed force into the surface of a specimen.

1.2 The values stated in SI units are to be regarded as the 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 and health practices and determine the applicability of regulatory limitations prior to use.

3.1 The Pusey and Jones indentation value is the depth of indentation, expressed in hundredths of a millimetre, of a ball 3.175 mm (0.1250 in.) in diameter under an expressed force of 9.8 N (2.2 lbf). This value may be used to compare the indentation resistance of rubber and rubber-like materials.

3.2 The indentation value obtained should not be confused with hardness as measured by Test Method D1415, since in the latter test the rubber immediately adjacent to the indentor is precompressed.

SDO ASTM: ASTM International
Document Number D531
Publication Date Aug. 1, 2015
Language en - English
Page Count 4
Revision Level 15
Supercedes
Committee D11.10
Publish Date Document Id Type View
April 1, 2026 D0531-15R26 Revision
Nov. 1, 2019 D0531-15R19 Revision
Aug. 1, 2015 D0531-15 Revision
Jan. 1, 2010 D0531-00R10 Revision
May 1, 2005 D0531-00R05 Revision
Nov. 10, 2000 D0531-89R99 Revision
Nov. 10, 2000 D0531-00 Revision