ASTM D1646-17
Standard Test Methods for Rubber—Viscosity, Stress Relaxation, and Pre-Vulcanization Characteristics (Mooney Viscometer)

Standard No.

ASTM D1646-17

Release Date

2017

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM D1646-19

Latest

ASTM D1646-19a

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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.7 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.

ASTM D1646-17 Referenced Document

• ASTM D1349 Standard Practice for Rubber-Standard Temperatures for Testing
• ASTM D1418 Standard Practice for Rubber and Rubber Latices-Nomenclature
• ASTM D1485 Standard Test Methods for Rubber from Natural Sources-Sampling and Sample Preparation
• ASTM D3182 Standard Practice for Rubber-Materials, Equipment, and Procedures for Mixing Standard Compounds and Preparing Standard Vulcanized Sheets
• ASTM D3185 Standard Test Methods for Rubber-Evaluation of SBR (Styrene-Butadiene Rubber) Including Mixtures With Oil
• ASTM D3186 Standard Test Methods for Rubber-Evaluation of SBR (Styrene-Butadiene Rubber) Mixed With Carbon Black or Carbon Black and Oil
• ASTM D3896 Standard Practice for Rubber From Synthetic Sources-Sampling
• ASTM D4483 Standard Practice for Determining Precision for Test Method Standards in the Rubber and Carbon Black Industries
• ISO 289 Rubber, unvulcanized; Determination of Mooney viscosity

ASTM D1646-17 history

• 2019 ASTM D1646-19a Standard Test Methods for Rubber-Viscosity, Stress Relaxation, and Pre-Vulcanization Characteristics (Mooney Viscometer)
• 2019 ASTM D1646-19 Standard Test Methods for Rubber—Viscosity, Stress Relaxation, and Pre-Vulcanization Characteristics (Mooney Viscometer)
• 2017 ASTM D1646-17 Standard Test Methods for Rubber—Viscosity, Stress Relaxation, and Pre-Vulcanization Characteristics (Mooney Viscometer)
• 2015 ASTM D1646-15 Standard Test Methods for Rubber&x2014;Viscosity, Stress Relaxation, and Pre-Vulcanization Characteristics (Mooney Viscometer)
• 2007 ASTM D1646-07(2012) Standard Test Methods for Rubbermdash;Viscosity, Stress Relaxation, and Pre-Vulcanization Characteristics (Mooney Viscometer)
• 2007 ASTM D1646-07 Standard Test Methods for Rubber-Viscosity, Stress Relaxation, and Pre-Vulcanization Characteristics (Mooney Viscometer)
• 2006 ASTM D1646-06 Standard Test Methods for Rubber-Viscosity, Stress Relaxation, and Pre-Vulcanization Characteristics (Mooney Viscometer)
• 2004 ASTM D1646-04 Standard Test Methods for Rubber8212;Viscosity, Stress Relaxation, and Pre-Vulcanization Characteristics (Mooney Viscometer)
• 2003 ASTM D1646-03a Standard Test Methods for Rubber8212;Viscosity, Stress Relaxation, and Pre-Vulcanization Characteristics (Mooney Viscometer)
• 2003 ASTM D1646-03 Standard Test Methods for Rubber8212;Viscosity, Stress Relaxation, and Pre-Vulcanization Characteristics (Mooney Viscometer)
• 2000 ASTM D1646-00 Standard Test Methods for Rubber-Viscosity, Stress Relaxation, and Pre-Vulcanization Characteristics (Mooney Viscometer)
• 1992 ASTM D1646-92 Standard Test Method for RubberÐViscosity and Vulcanization Characteristics (Mooney Viscometer)
• 1981 ASTM D1646-81 Standard Test Method for Rubber - Viscosity And Vulcanization Characteristics ( Mooney Viscometer)