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. CCSi Ultra-Life Specimen Cutting Dies: ASTM D D Upper Specimen Die. D Lower Specimen Die. CCSi manufactures these high quality. Standard Astm d – Download as PDF File .pdf), Text File .txt) or read online.

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E Use a temperature of 6 0.

ASTM D1646 rubber rheometer mooney viscometer

Values obtained with one rotor shall not be converted to equivalent values for the other rotor since the relationship between rotors may vary depending on the type of rubber and test conditions.

If not, establish a procedure. Computer control, Data display, Automatic calibration, Imported intelligent digital temperature controller. This standard has been approved for use by agencies of the Department of Defense.

ASTM D e1. For these higher molecular mass rubbers, better correlation between viscosity values and molecular mass is obtained if the test temperature is increased.

For these higher molecular weight rubbers, better correlation between viscosity values and molecular weight is obtained if the test temperature is increased. Other temperatures may be used if desired. The relaxation data shall be collected starting typically 1 s after asmt rotor is stopped, and continuing for at least 1 min and typically for 2 min awtm the rotor is stopped.

This can result in different viscosity values for some rubbers. The viscometer shall be adjusted so that it will read zero torque when run empty and 6 0. 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.

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If the stress relaxation test is to be performed, the instrument must be capable of stopping the rotation of the disk and monitoring the relaxation of stress versus time. Contact Supplier Start Order.

Testing Standards List

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. NOTE 10—Resetting torque to a static zero is necessary because the dynamic zero used for the viscosity test would result in a negative torque value once the material had completely relaxed with a stationary disk.

Bias, therefore, cannot be determined. Results of a typical stress relaxation test would be reported as follows: Historical Version s – view previous versions of standard. Calibrated platinum resistance temperature sensors capable of indicating the temperature to within Automatically determine the torque, real-time display temperature value and set value After vulcanizing, automatically process, calculate, print Mooney curve, scorch curve and technology parameter.

Mooney viscosity curve, Mooney scorch curve, temperature curve of the upper and lower mold 4. At the end of a Mooney viscosity test, the rotation of the metal disk is suddenly stopped and the rate of decrease of torque is monitored as a function of time.

It shall not be permissible to slip the test piece around the rotor stem by cutting it edgewise. Modify the time during testing 5. Stress relaxation is also a function of the test configuration and for these test methods the results are unique to the Mooney viscometer. Link to Active This link will always route to the current Active version of the standard.

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Contact Supplier Start Order. These test methods include procedures for measuring the initial rate of rubber vulcanization. The Mooney viscosity is measured by a metal disk embedded in qstm rubber specimen contained in a rigid cylindrical cavity maintained d146 a speci?

Integrated die cavity, high accuracy. 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.

Since rubber behaves as a non-Newtonian? Refer to Practice D for terminology and other statistical details. Therefore, this test method can be used to measure incipient cure scorch time and the rate of cure during very early stages of vulcanization.

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ASTM D1646 Rubber Rheometer Mooney Viscometer

Therefore, it may be expected that the viscosity values obtained for a rubber tested on different machines will be more comparable if taken after temperature equilibrium of the specimen is attained.

No pronounced increase in r and Ris evident. Therefore, a torque of 0. Mooney r1646 measurement accuracy: