ASTM D Valid from. 01/07/ Information provider. American Society of Testing and Materials. Author. American Society of Testing. ASTM D Standard Test Method for Rubber-Deterioration in an Air Oven. ASTM D Standard Test Method for Rubber—Deterioration in an Air Oven.
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D — 04 Standard Test Method for Rubber—Deterioration in an Air Oven1 This standard is issued under the xed designation D ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision.
A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval.
C573 standard has been approved for use by agencies of the Department of Defense. The results of this test method may not give an exact correlation with service performance since performance conditions vary widely. This test method may, however, be used to evaluate rubber compounds on a ashm comparison basis. The values given in parentheses are for information only. 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.
For specic precautionary statement, see Note 1. Current edition approved July 1, Originally approved in Last previous edition approved in as D — Summary of Test Method 3.
These are compared with the properties determined on the original specimens and the changes noted. Signicance and Use 4.
This test method provides a way to assess these performance characteristics of rubber, under certain accelerated conditions as specied. For higher temperatures, Type IIA ovens are necessary.
Located in the upper central portion of the chamber near the center of the aging specimens. For apparatus not equipped with automatic recording capabilities, temperature shall be measured with ast frequency to ascertain that the temperature limits specied in When a motor-driven fan is used, the air must not come in contact with the fan motor brush discharge because of danger of ozone formation.
ASTM D573 – 04(2015)
The preferred location is adjacent to the recording thermometer. At least 24 h must elapse between completion of the vulcanization of the samples and the start of the aging test. But if the results are below the specied requirements, asfm additional specimens shall be prepared from the original sample and tested.
Should the results of either of these tests be below the specied requirements, the sample shall be considered to have failed to meet the specications.
Their form shall be such that no mechanical, chemical, or heat treatment will be required after exposure. If any adjustments for example, to thickness are necessary, they should d5733 performed prior to exposure. Gage lines used for measuring elongation shall be applied after the specimens have been aged. Only specimens of similar dimensions having approximately the same exposed areas may be compared with each other.
Number of D537 Specimens 8. If the results are below the specied requirements, two additional specimens shall be prepared from the original sample and tested. Should the results of either of these tests be below the specied requirements, the samples shall be considered to have failed to meet the specications.
Tests of Unaged Specimens 9. Results on specimens that are found to be imperfect shall be discarded and retests shall be made. Procedure for Accelerated Aging If possible, avoid simultaneous aging of a mixed group of different compounds.
For instance, high-sulfur compounds should not be aged with low-sulfur compounds and those containing antioxidants shall not be aged with those having no antioxidants. Some migration is known to occur. With rapid aging types of rubber or those containing or contaminated by certain oxidizing chemicals, the rate of oxidation may be catalyzed to such an extent d57 to become violent with increasing temperatures.
The selection of suitable intervals of aging will depend on the rate of deterioration d5733 the particular material being tested.
ASTM D – 04() – Standard Test Method for Rubber-Deterioration in an Air Oven
Intervals frequently used are 3, 7, and 14 days. In experimental work, it is desirable to use a range of periods, while for routine tests of known materials, fewer intervals may be employed.
Apply the gage lines to the specimens for use in measuring elongations. Physical Tests of Aged Specimens In determining the physical properties after aging, the nal values shall be the median of results from three specimens except that under the following conditions two additional specimens shall be exposed and tested and the median of the values for the ve specimens shall be used: After completion of the tests, the broken specimens shall be examined visually and manually and their condition noted.
Precision and Bias 4 Refer to this practice for terminology and other statistical calculation details. Both repeatability and reproducibility are short term, a period of a few days separates replicate test results. A test result is expressed on the basis of a median value, as specied by Test Methods D obtained on three determinations or measurements of the property or parameter in question.
Please see Annex A1 for more details on this work. The appropriate value is that value of r or R associated with a mean level in the precision tables closest to the mean level under consideration at any given time, for any given material in routine testing operation. Two single test results, obtained under normal test method procedures, that differ by more than this tabulated r for any given level must be considered as derived from different or non-identical sample populations.
Two single test results obtained in two different laboratories, under normal test method procedures, that differ by more than the tabulated R for any given level must be considered to have come from different or nonidentical sample populations. Also the value of r or R, or both, does not vary with the magnitude of percent elongation or percent tensile strength change.
No values are given for r or R because of the near zero average values for some of the materials. Reference values do not exist for this test method since the value of the test property is exclusively dened by the test method. Bias, therefore, cannot be determined. In this initial precision work, some of the standard compounds that were currently included in Methods D 15 were used. These tables are listed below. This test method is selected as a location since it is the most frequently used standard test for evaluating compounds for accelerated aging performance.
A common supply astk set up for all the materials needed to prepare compounds in accordance with the tables of this Annex. All laboratories that participated in any interlaboratory program drew their materials from this common uniform supply; thus the within-materials source of variation was reduced to the lowest possible practical ast. Weigh ingredients to nearest 0.
For those blacks where 75 parts are used, the calculated specic gravity is 1.
ASTM D573 Rubber – Deterioration in an Air Oven
IRB or Industry Reference Black may be used as a suitable alternative, but the same results may not be obtained. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every ve years and if not revised, either reapproved or withdrawn.
Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
Your comments will receive careful consideration at a meeting of the aztm technical committee, which you may attend. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address dd573 below. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.