Astm d 1646 pdf free download

Take as the viscosity the minimum value to the nearest whole unit during this interval. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Stress relaxation is also a function of the test configuration and for these test methods the results are unique to the Mooney viscometer.

Specifications Computer control, Data display, Automatic calibration, Imported intelligent digital temperature controller. The surfaces of d die cavity shall either be serrated or contain V-grooves to minimize slippage of the specimen.

It shall not be permissible to slip the test piece around the rotor stem by cutting it edgewise. NOTE 6—If the viscometer has a seal between the rotor stem and the die, frequent zero adjustment may atm necessary because of a change in friction between the rotor stem and the seal. Therefore, this test method can be used asttm measure incipient cure time and the rate of cure during very early stages of vulcanization.

The relaxation data shall be collected starting typically 1 s after the rotor is stopped, and continuing for at least 1 min and typically for 2 min after the rotor is stopped. Contact Supplier Start Order. Usually this condition is reached about 10 min after the machine is closed on the specimen.

Results of a typical stress relaxation test would be reported as follows: The precision expressed as as percentage of the mean, r and Rwas highest for materials with the fastest decay rates high negative slope values and the lowest stress relaxation intercept values. For these higher molecular weight rubbers, better correlation between viscosity values and molecular weight is obtained if the test temperature is increased.

This test method cannot be used to study complete vulcanization because the continuous 1d of the disk will result in slippage when the specimen reaches a stiff consistency. The test data can be saved automatically 6. China viscose d China 50 cotton 50 viscose China 65 polyester 35 viscose.

Contact Supplier Start Order. The test specimen shall be as free of air and volatile materials as it is practical to make it and shall be free of pockets which may trap gasses against the rotor or die d Packaging Details Standard export wooden case Port china seaport. Thus both of these tests are important and complement each other. 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.

If an exact relationship is required, it should be established for each rubber and set of test astj. Stress relaxation is also a function of the test configuration and for these test methods the results are unique to the Mooney viscometer.

The Mooney ast, shall incorporate the following components: The pieces shall be cut from the prepared specimen and shall be of such dimensions that they will? Both r and R vary with material type. For all but the lowest viscosity material BRthe precision for unmassed specimens is better than for mill massed specimens.

Place the second test piece on the center of the rotor, close the dies immediately, and activate the timer Note 7. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM Headquarters.

Therefore, a torque of 0. 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. The dimensions of the shearing disk viscometer, test temperatures, and procedures for determining Mooney viscosity are defined in these test methods. Used to Raw rubber or rubber compound for the determination of Viscosity, scorch and curing awtm. ASTM D natural rubber mooney viscosity meter.

This table also shows details on the formulation and rotor size used for the testing. Open the mill rolls to 3 6 0. For there materials, the precision for unmassed specimens is better than for mill massed specimens. China oil viscometer China digital viscometer China kinematic viscometer. Take as the viscosity the minimum value to the nearest whole unit during this interval.

It is a necessary equipment for regenerated f, rubber and wire and cable industries. A greater force may be required to close the dies when tests are made on stocks having extreme toughness. The recommended test temperatures are those speci? The disk is slowly and continuously rotated in one direction for a speci? A number in parentheses indicates the year of last reapproval.

China viscometer bath China capillary viscometer China viscometer apparatus. When the small rotor is used satm increase is 18 units and the time is designated t Computer control, Data display, Automatic calibration 2.

Sheet the specimen on the tenth pass. Sheet the specimen on the tenth pass. Mooney viscosity is de? These precision parameters should not be used for acceptance or rejection testing of any group of materials without documentation that they are applicable to those particular materials and the speci?

Then stop the rotation of the disk. Either situation will result in undue leakage and erroneous results. When the large rotor is used the increase is 35 units and the time is designated t The curing characteristics reported in The small rotor shall conform to the large rotor except the diameter shall be The dimensions of the die cavity, measured from the highest surfaces, shall be The torque measuring system shall record the torque during the relaxation test at minimum rates of one reading each second for the?

China viscose yarn China viscose crepe fabric China viscose elastane fabric. The large rotor should be used unless the Mooney viscosity would exceed the capacity of the instrument, or when slippage occurs or is suspected.

The permissible tolerance shall be Over the range of parameter values levels there is a general increase in r and R as the mean level increases. This can result in different viscosity values for some rubbers.

The serrations of the dies shall consist d two sets of such grooves at right angles to each other.