ASTM D1646 EPUB

ASTM D covers the test methods for measuring Mooney Viscosity, Mooney Stress Relaxation, and Mooney Scorch. Mooney Viscosity and Stress Relaxation . This standard is issued under the fixed designation D ; the number 1 These test methods are under the jurisdiction of ASTM Committee D11 on. Standard Astm d – Download as PDF File .pdf), Text File .txt) or read online.

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The values given in parentheses are for information only.

Mooney viscosity is defined as the shearing torque resisting rotation of a cylindrical metal disk or rotor embedded in rubber x1646 astm d1646 cylindrical cavity. This can result in different viscosity values for some rubbers. Viscosity and astm d1646 relaxation behavior do not depend on such factors as molecular weight and non-rubber constituents in the same way. Historical Version s – view previous versions of standard Translated Version s: Historical Version s d646 view previous versions of standard.

astm d1646

ASTM D1646

Stress relaxation is also a function of the test configuration and for these test methods the results are unique to astm d1646 Mooney viscometer. This is called ‘stress relaxation’ and these astm d1646 methods describe a test method for measuring this relaxation.

Since rubber behaves as a non-Newtonian fluid, no simple relationship exists between the molecular weight and the viscosity. The dimensions of the shearing disk viscometer, test temperatures, and procedures for determining Mooney viscosity are defined in these test methods. These test methods include procedures for measuring the initial rate of rubber vulcanization. This can result in different viscosity astm d1646 for some rubbers. Viscosity as used in these test methods is not a astm d1646 viscosity and should be interpreted to mean Mooney viscosity, a measure of shearing torque averaged over a range of shearing rates.

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Mooney viscosity is defined as the shearing torque resisting rotation of a cylindrical metal disk or astm d1646 embedded in rubber within a cylindrical cavity. 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. Active view current version of standard. These test methods include procedures for measuring the initial rate of rubber vulcanization.

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

Stress relaxation is also a function of the test configuration and for these test methods the results are astm d1646 to the Mooney viscometer. Referenced Documents purchase separately The documents listed below are referenced within astm d1646 subject standard but are not provided as part of the standard. The dimensions of the shearing disk viscometer, test temperatures, and procedures for determining Mooney viscosity are defined astm d1646 these test methods.

The rate of stress relaxation has been found to correlate with rubber structure characteristics such as molecular weight distribution, chain branching, and gel content.

Testing Standards List

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. In addition to a few insignificant differences there are astm d1646 technical differences between ISO and this astm d1646 method in that ISO does astm d1646 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. Aastm addition to a few insignificant differences wstm are major technical differences atsm ISO and this test method astm d1646 that ISO does not provide for sample preparation on a mill, while d6146 test method astm d1646 milling sample preparation in some cases prior to running a Mooney viscosity test.

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This test method cannot be used to study astm d1646 vulcanization because the continuous rotation of the disk will result in slippage when the specimen reaches a stiff consistency. Link to Active This link will always route to the current Active version of the standard. 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.

Referenced Documents purchase separately The documents listed below are referenced within the wstm standard but are not provided as part of the standard. Thus both of these tests are important and complement each other. The values given in parentheses are for information only. It is the responsibility of the user of this ast to establish appropriate safety, health, astm d1646 environmental practices and determine the applicability astm d1646 regulatory limitations prior astm d1646 use.

Therefore, caution must be exercised in interpreting viscosity values of rubber, particularly d16646 cases where molecular astm d1646 is very high. Therefore, this test method can be used to measure incipient cure scorch time and the rate of cure during very early stages of vulcanization.