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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For all but the lowest viscosity material BRthe precision for unmassed specimens is better than for mill massed specimens.
The Mooney viscometer shall incorporate the following components: Computer real-time display test process, can directly read the changing process of temperature and time-Mooney viscosity from the computer.
If an exact relationship is required, it should be established for each rubber and set zstm test conditions. Either situation will result in undue leakage and erroneous results. Test temperatures are 6 0. Do not allow the specimen to rest between passes or to band on the mill rolls at any time. Last previous adtm D — 98a. 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.
If the stress relaxation test is to be performed, the torque measuring system must reset to a zero force for a stationary rotor. When the small rotor is used this increase is 3 units and the time is designated t3. A number in parentheses indicates the year of last reapproval. The Mooney aatm measures the effect of temperature and time on the viscosity of rubbers.
Mooney viscosity curve, Mooney scorch curve, temperature curve of the upper and lower mold s1646.
Place the second test piece on the center of the rotor, close the dies immediately, and activate the timer Note 7. Results of a typical test would be reported as follows: Record the following information: The temperature of the two dies shall be within 0. 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.
These test methods include procedures for measuring the initial rate of rubber vulcanization. NOTE 7—A brass pry rod with a?
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.
Therefore, this asstm method can be used to measure incipient cure scorch time and the rate of cure during very early stages of vulcanization.
Stress relaxation is also a function of the test con? A number of test data and curves can be displayed on one piece of paper, and used the mouse click to read the value of any point on the curve 7. Your comments are invited either astk revision of this standard or for additional standards and should be addressed to ASTM Headquarters.
Testing Standards List
The test data can be saved automatically 6. The values given in parentheses are for information only. Reference values do not exist for this test method since the value of the test property is exclusively de?
A slow rate of relaxation indicates a higher elastic component in the overall response, while a rapid rate of relaxation indicates a higher viscous component.
This can result in different viscosity values sstm some rubbers.
No pronounced increase in r and Ris evident. Either record the viscosity continuously or take sufficient readings to permit the preparation of a complete time-viscosity curve example shown in Fig.
For convenience the mass of the test specimen aztm correct volume may be calculated as follows: Link to Active This link will always route to the current Active version of the standard. Test specimen mass shall be within a tolerance of6 3 g. This was a Type 1 precision program; all compounds were prepared for testing by a single laboratory using the procedures in test methods D and D 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.
If not, establish asrm procedure. Not exactly what you want? Since rubber behaves as a non-Newtonian?
The precision expressed as as percentage of the d146, r and Rwas highest for materials with the fastest decay rates high negative slope values and the lowest stress relaxation intercept values. The running time should never be less than 2 min. 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 d1466 a function of time. Thus both of these tests are important and complement each other.
This was a Type 1 precision program; all samples were presented by a single laboratory, and tested without mill massing. 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.