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ASTM D1646-04

Historical Revision

Standard Test Methods for Rubber—Viscosity, Stress Relaxation, and Pre-Vulcanization Characteristics (Mooney Viscometer)

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1.1 These test methods describe procedures for measuring a property called Mooney viscosity. Mooney viscosity is defined as the shearing torque resisting rotation of a cylindrical metal disk (or rotor) embedded in rubber within a cylindrical cavity. The dimensions of the shearing disk viscometer, test temperatures, and procedures for determining Mooney viscosity are defined in these test methods.

1.2 When disk rotation is abruptly stopped, the torque or stress on the rotor decreases at some rate depending on the rubber being tested and the temperature of the test. This is called 'stress relaxation' and these test methods describe a test method for measuring this relaxation.

Note 1— Viscosity as used in these test methods is not a true viscosity and should be interpreted to mean Mooney viscosity, a measure of shearing torque averaged over a range of shearing rates. Stress relaxation is also a function of the test configuration and for these test methods the results are unique to the Mooney viscometer.

1.3 When compounded rubber is placed in the Mooney viscometer at a temperature at which vulcanization may occur, the vulcanization reaction produces an increase in torque. These test methods include procedures for measuring the initial rate of rubber vulcanization.

1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

1.5 ISO Standard 289 Parts 1 and 2 also describes the determination of Mooney viscosity and pre-vulcanization characteristics. In addition to a few insignificant differences there are major technical differences between ISO 289 and this test method in that ISO 289 does not provide for sample preparation on a mill, while this test method allows milling sample preparation in some cases prior to running a Mooney viscosity test. This can result in different viscosity values for some rubbers.

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.


SDO ASTM: ASTM International
Document Number D1646
Publication Date Jan. 1, 2004
Language en - English
Page Count 12
Revision Level 04
Supercedes
Committee D11.12
Publish Date Document Id Type View
Nov. 1, 2019 D1646-19A Revision
July 1, 2019 D1646-19 Revision
Dec. 1, 2017 D1646-17 Revision
Dec. 15, 2015 D1646-15 Revision
Nov. 1, 2007 D1646-07 Revision
Dec. 1, 2006 D1646-06 Revision
Jan. 1, 2004 D1646-04 Revision
June 10, 2003 D1646-03A Revision
Jan. 10, 2003 D1646-03 Revision
Nov. 10, 2000 D1646-00 Revision
Not Available D1646-92 Revision
Not Available D1646-81 Revision
May 1, 2012 D1646-07R12 Reaffirmation