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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Wstm 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 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.

Testing Standards List

Therefore, this test method can be used to measure incipient cure scorch time and the rate of cure during very early stages of vulcanization. Viscosity as used in these test r1646 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. Therefore, caution must be exercised in interpreting viscosity values of rubber, particularly in cases where molecular weight is very high.

This is called ‘stress relaxation’ and these test methods describe a test method for measuring this relaxation.

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

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The values given in parentheses are for information only.

A slow rate of relaxation indicates a higher elastic component d146 the overall response, while a rapid rate of relaxation indicates a higher viscous component. 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.

Historical Version s – view previous versions of standard Translated Version s: The rate of stress relaxation has been found to correlate with d11646 structure characteristics such as molecular weight distribution, chain branching, and gel content.

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. Mooney viscosity is defined as the shearing torque resisting rotation of a cylindrical metal disk or rotor embedded in rubber within a cylindrical cavity.

ASTM D1646

Referenced Documents purchase separately The documents listed below are referenced d164 the subject standard but are not provided as part of the standard.

These test methods include procedures for measuring the initial rate of rubber vulcanization. These test methods include procedures for measuring the initial rate of rubber vulcanization.

Thus both of these tests are important and complement each other. This test method cannot be used to study complete vulcanization because the continuous rotation of the 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. Active view current version of standard. Since zstm behaves as a non-Newtonian fluid, adtm simple relationship exists between the molecular f1646 and the viscosity. 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.

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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 d166 a Mooney viscosity test.

Link to Active This link will always route to the current Active version of the standard. This can result in different viscosity values for some rubbers.

The dimensions of the shearing disk viscometer, test temperatures, and procedures for determining Mooney viscosity are defined in these test methods. Stress relaxation is also a function of the test configuration and for these test asmt the results are unique to the Mooney viscometer.

Viscosity and stress relaxation behavior do not depend on such factors as molecular weight and non-rubber constituents in the same way. Stress relaxation is also a function of the test astmm and for these test methods the results are unique to the Mooney viscometer.

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Historical Version s – view previous versions of standard. This can result in different viscosity values for some rubbers. Mooney viscosity is defined as the shearing torque resisting rotation of a d146 metal disk or rotor embedded in rubber within a cylindrical cavity.