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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The curing characteristics reported in Computer real-time display test process, can directly read the changing process of temperature and time-Mooney viscosity from the computer.

Specifications Computer control, Data display, Automatic calibration, Imported intelligent digital temperature controller.

Testing Standards List

This volume is approximately 1. These serrations consist of rectangular grooves 0. For these higher molecular mass rubbers, better correlation between viscosity values and molecular mass is obtained if the test temperature is increased.

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.

The small rotor shall conform to the large rotor except the diameter shall be This can result in different viscosity values for some rubbers. The dimensions of the x1646 disk viscometer, test temperatures, and procedures for determining Mooney viscosity are defined in these test methods.

ASTM D1646

The serrations of the dies shall consist of two sets of such grooves at right angles to each other. Historical Version s – view d146 versions of standard. The active element of the sensor shall be 3 to 5 mm 0.

Feature of Control Software: It is a necessary equipment for regenerated adtm, rubber and wire and cable industries. Take as the viscosity the minimum value to the nearest whole unit during this interval.

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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. This test method describes how pre-vulcanization properties may be measured. NOTE 3—For mechanical-type closure viscometers, asmt pressure on the die cavities may change if the viscometer is used at a different temperature than that at which it is adjusted.

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. Do not allow the specimen to rest qstm passes or to band on the mill rolls at any time. They shall extend from the 7-mm 0.

Precision and Bias 7 Record the following information: For all but the lowest viscosity material BRthe precision for unmassed specimens is better than for mill massed specimens. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applica1 These test methods are under the jurisdiction of ASTM Committee D on Rubber and is the direct zstm of Subcommittee D ASTM D x1646.

ASTM D rubber rheometer mooney viscometer. Therefore, caution must be exercised in interpreting viscosity values of rubber, particularly in cases where molecular mass is very high. A 5 area under the relaxation curve from to to the end of tf the stress relaxation test Mooney units-secondsand to 5 beginning time of the stress relaxation test, s, and. The large rotor shall be Summary of Test Methods 4. At least 10 s before the motor is started, f1646 force should be reduced to When the small rotor is used this increase is 3 units and c1646 time is designated t3.

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Results of a typical stress relaxation test would be reported as follows: These test methods include procedures for measuring the initial rate of rubber vulcanization. Therefore, this test method can be used to measure incipient cure time and the rate of cure during very early stages of vulcanization.

These precision parameters should not aztm used for acceptance or rejection testing of any group of materials without documentation that they are applicable to those particular materials and the speci? NOTE 2—The two types of dies may not give the same results.

For convenience the mass of the test specimen of correct volume may be calculated as follows: Over the range of parameter values levels there is a general increase in r and R as the mean level increases. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of d164 standard.

Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM Headquarters. HYII Mooney Viscometer is used to determine the Mooney viscosity, scorch time and vulcanization index of natural rubber, synthetic rubber and regenerated rubber. This adjustment should be made with the dies open for machines with rotor ejection springs so the rotor does not rub against the upper diebut with the dies closed for all other types of machines.

A temperature sensor shall be located in each die for control of the die temperature. When the d16446 rotor is used the increase is 5 units and the time is designated t5. Mooney value measurement accuracy: