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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ASTM D e1. A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense.

Mooney viscosity is de? The dimensions of the shearing disk viscometer, test temperatures, and procedures for determining Mooney viscosity are de? NOTE 1—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 astmm shearing rates.

Stress relaxation is also a function of the test con? These test methods include procedures for measuring the dd1646 rate of rubber vulcanization. The 1d646 given in parentheses are for information only.

Testing Standards List

In addition to a few insigni? This can result in different viscosity values for some rubbers. 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 responsibility of Subcommittee D Current edition approved May 10, Originally published as D — 59T.

Last previous edition D — 98a. Summary of Test Methods 4. This test method describes the measurement of the Mooney viscosity. The Mooney viscosity is measured by a metal d16466 embedded in a rubber specimen contained in a rigid cylindrical cavity maintained at a speci?

The disk is slowly and continuously rotated in one direction for a speci? The resistance to this rotation offered by the rubber is measured in arbitrary torque units as the Mooney viscosity of the specimen.

This test method describes the procedure to measure stress relaxation. At the end of a Mooney viscosity test, the rotation of the metal disk is suddenly stopped and the rate of asttm of torque is monitored as a function of time. This test method describes how pre-vulcanization properties may be measured.

The viscosity of vulcanizable rubber compounds is recorded during heating at a 1d646 The minimum viscosity and the times for the viscosity to increase by speci? Since rubber behaves as a non-Newtonian? Therefore, caution must be exercised in interpreting viscosity values of rubber, particularly in cases where molecular mass is very high. For these higher molecular mass rubbers, better correlation between viscosity values and molecular mass is obtained if the test temperature is increased.

Viscosity and stress relaxation behavior do not depend on such factors as molecular mass and non-rubber constituents in the same way. Thus both of these tests are important dd1646 complement each other. A slow rate of relaxation indicates a higher elastic component in the overall astn, while a rapid rate of relaxation indicates a higher viscous component.

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The rate of stress relaxation has been found to correlate with rubber structure characteristics such ashm molecular mass distribution, sstm branching, and gel content. Therefore, this test method can be used to measure incipient cure time and the rate of cure during very early stages of vulcanization. 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 Mooney viscometer measures the effect of temperature and time on the viscosity of rubbers.

If the stress relaxation test is to be performed, the instrument must be capable of stopping the rotation of asgm disk and monitoring the relaxation of stress versus time. The die-rotor relationship of one design is shown in Fig. The Mooney viscometer shall incorporate the following components: The dimensions of the die cavity, measured from the highest surfaces, shall be The surfaces of the e1646 cavity shall either be serrated or contain V-grooves to minimize slippage of the specimen.

NOTE 2—The two types of dies may not give the same results. These serrations consist of rectangular grooves 0. The grooves shall be vertical and shall be cut on 1. The serrations of the dies shall astmm of two sets of such grooves at right angles to each other. They shall extend from the 7-mm 0. The grooves shall be 1 6 0.

A aatm force may be required to close the dies when tests are made on stocks having extreme toughness. At least 10 s before the motor is started, the v1646 should be reduced to The die closure shall be such that a piece of thin soft tissue with a thickness not greater than 0.

A nonuniform pattern indicates wear of the die holder surface or distortion of dies and die holders. Either situation will result in undue leakage and erroneous results. NOTE 3—For mechanical-type closure viscometers, the pressure on the die cavities c1646 change if the viscometer is used at a different temperature than that at which it is adjusted.

They shall be fabricated from a nondeforming tool steel, shall have an unplated? The large rotor shall be The small rotor shall conform to the large rotor except the diameter shall be The serrations on the face of the rotor shall 4 Decker, G. The rotor head shall be securely mounted perpendicularly to a suitable straight cylindrical stem not exceeding 11 mm 0.

The rotor head shall be positioned so that the top and bottom surfaces are 2. The wear tolerance from the center position should astk exceed6 0.

A suitable seal shall be provided in the lower die having a minimum clearance and constant torque when the machine is run empty. The eccentricity, or runout, shall not exceed 0. Any rotor worn to such an extent that the rotor diameter is less than the minimum diameter shown in this procedure shall not be used.

The permissible tolerance shall be The temperature measuring system shall consist of platinum resistance temperature sensors, thermocouples, or thermistors.

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ASTM D1646

Calibrated platinum resistance temperature sensors capable of indicating the temperature to within A temperature sensor shall be located in each die for control of the die temperature. The active element of the sensor shall be 3 to 5 mm 0.

If the stress relaxation test is to be performed, the asm measuring asgm must reset to a zero force for a stationary rotor. The torque measuring system shall record the torque during the relaxation test at minimum rates of one reading each second for the? Better repeatability within labs and reproducibility between labs is normally obtained on unmassed specimens. Asfm, the sample may be massed to expel air, to consolidate particles, or to modify it, if necessary. When mill massing is required use the sample preparation steps shown in 7.

When specimens cannot be easily cut from the unmassed material and mill massing is not appropriate, the manufacturer of the material should be asked to recommend an alternate sample preparation procedure.

For best reproducibility of results, minimum work shear should be done to the material during specimen preparation. Roll the specimen and immediately insert it endwise in the mill for another pass.

Repeat this procedure until a total of ten passes have been completed. Sheet the specimen on the tenth pass. Immediately fold the specimen in half and insert the folded end into the mill for a second pass. Repeat this procedure until a total of nine passes have been completed. Immediately insert the rubber without folding into the mill for a tenth pass. Do not allow the specimen to rest between passes axtm to band on the mill rolls at any time.

ASTM D1646 natural rubber mooney viscosity meter

Immediately fold the specimen in half and inserted the folded end into the mill for a second pass. Open the mill rolls to 3 6 0. This piece asgm be cut in a way that will minimize astk on the sample. If not, establish a procedure. See Practice D Test temperatures are 6 0.

C Time after the standard 1. D If no air bubbles are visible in the sample, 7. E Use a temperature of 6 0. Allow massed specimens to rest at room temperature for at least 30 min before measuring their viscosity. This volume is approximately 1. For convenience the mass of the test specimen of correct volume may be calculated as follows: The viscometer shall be adjusted so that it will read zero torque when run empty and 6 0.

Therefore, d16446 torque of 0. The use of this or any other reference rubber shall not be used as a substitute for mechanical calibration as described in this section of the standard. The large rotor should asmt used unless the Mooney viscosity would exceed the capacity of the instrument, or when slippage occurs or is suspected. However, when slippage occurs with the large rotor, changing to the small rotor may not prevent it.