ASTM-D1646:2012 Edition

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D1646-07(2012) Standard Test Methods for Rubber—Viscosity, Stress Relaxation, and Pre-Vulcanization Characteristics (Mooney Viscometer)

Published By	Publication Date	Number of Pages
ASTM	2012	12

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Description

ASTM D1646-07-Reapproved2012

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

ASTM D1646

Scope

1.1 These test methods cover 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 ISO 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.

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

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.

Keywords

curing characteristics; Mooney; stress relaxation; viscosity; vulcanization characteristics ; Curing characteristics–rubber; Mooney viscosity testing; Pre-vulcanization characteristics; Rubber property analysis; Stress relaxation tests; Viscometers–Mooney; Viscosity–rubber; Vulcanization characteristics

ICS Code

ICS Number Code 83.060 (Rubber)

DOI: 10.1520/D1646-07R12

PDF Catalog

PDF Pages	PDF Title
1	Scope Referenced Documents Terminology
2	Summary of Test Methods Significance and Use Apparatus
3	FIG. 1
4	Sample Preparation TABLE 1
5	Test Specimen Calibration Procedure
6	Report Procedure FIG. 2
7	Report Procedure FIG. 3
8	Report Precision and Bias FIG. 4
9	TABLE 2
10	TABLE 3 TABLE 4
11	Keywords TABLE 5 TABLE 6

Additional information

Standard Title	D1646-07(2012) Standard Test Methods for Rubber—Viscosity, Stress Relaxation, and Pre-Vulcanization Characteristics (Mooney Viscometer)
Published Code	ASTM
Publication Date	2012
Pages Count	12