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ASTM D1646 PDF

This standard is issued under the fixed designation D ; the number 1 These test methods are under the jurisdiction of ASTM Committee D11 on. ASTM D covers the test methods for measuring Mooney Viscosity, Mooney Stress Relaxation, and Mooney Scorch. Mooney Viscosity and Stress Relaxation . CCSi Ultra-Life Specimen Cutting Dies: ASTM D D Upper Specimen Die. D Lower Specimen Die. CCSi manufactures these high quality.

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Testing Standards List

Active view current version of standard. 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. The values given in parentheses are for information only.

Since rubber behaves as a non-Newtonian fluid, no simple relationship exists between the molecular weight and the viscosity. Stress relaxation is also a function of the test asfm and for these test methods the results are unique to the Mooney viscometer. The rate of stress relaxation has been found to correlate with rubber structure characteristics such as molecular weight distribution, chain branching, and gel content.

The dimensions of the shearing disk viscometer, test temperatures, and procedures d146 determining Mooney viscosity are defined in these test methods.

ASTM D1646

This is called ‘stress relaxation’ and these test methods describe a test method for measuring this relaxation. Thus both of these tests are important and complement each other.

In addition to a few insignificant differences there are major technical differences between ISO and this test method in that ISO 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. Link to Active This link will always route to the current Active version of the standard.

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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. These test methods include procedures for measuring the initial rate of rubber vulcanization. A slow rate of relaxation indicates a higher elastic component in the overall response, while a rapid rate of relaxation indicates a higher viscous component.

This can result in different viscosity values for some rubbers. Viscosity and stress relaxation behavior do not depend on such factors as molecular weight and non-rubber constituents in the same way. Therefore, this test method can be used to measure incipient cure scorch time and the rate of cure during very early stages of vulcanization. Stress relaxation is also a function of the test configuration and for these test methods the results are unique to the Mooney viscometer.

For these higher molecular weight rubbers, better correlation between viscosity values and molecular weight is obtained if the test temperature is increased.

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Mooney viscosity is defined as the shearing torque resisting rotation of a cylindrical metal disk or rotor embedded in rubber within a cylindrical cavity.

These test methods include procedures for measuring the initial rate of rubber vulcanization. Mooney viscosity is defined as the shearing torque resisting rotation of a cylindrical metal disk or rotor embedded in rubber within a cylindrical cavity. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. In addition to a few insignificant differences there are major technical differences between ISO and this test method in that ISO 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.

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Historical Version s – view previous versions of standard. Therefore, caution must be exercised in interpreting viscosity values of rubber, particularly in cases where molecular weight is very high.

Link to Active This link will always route to the current Active version of the standard.

The values given in parentheses are for information only. Historical Version s – view previous versions of standard Translated Version s: This can result in different viscosity values for some rubbers.

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 asm of shearing rates. This test method cannot be used to study complete vulcanization because the continuous rotation of astn disk will result in slippage when the specimen reaches a stiff consistency.

The dimensions of the shearing disk viscometer, test temperatures, and procedures for determining Mooney viscosity are defined in these test methods.

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.