ASTM D865-1999(2005) Standard Test Method for Rubber-Deterioration by Heating in Air (Test Tube Enclosure)《橡胶的空气中加热变质的标准试验方法(试管封闭法)》.pdf
《ASTM D865-1999(2005) Standard Test Method for Rubber-Deterioration by Heating in Air (Test Tube Enclosure)《橡胶的空气中加热变质的标准试验方法(试管封闭法)》.pdf》由会员分享,可在线阅读,更多相关《ASTM D865-1999(2005) Standard Test Method for Rubber-Deterioration by Heating in Air (Test Tube Enclosure)《橡胶的空气中加热变质的标准试验方法(试管封闭法)》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 865 99 (Reapproved 2005)Standard Test Method forRubberDeterioration by Heating in Air (Test TubeEnclosure)1This standard is issued under the fixed designation D 865; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, th
2、e year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript 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.1. Scope1.1 This test method covers a
3、procedure to determine thedeterioration induced by heating rubber specimens in indi-vidual test tube enclosures with circulating air. This isolationprevents cross contamination of compounds due to loss ofvolatile materials (for example, antioxidants) and their subse-quent migration into other rubber
4、 compounds (specimens). Theabsorption of such volatile materials may influence the degra-dation rate of rubber compounds.1.2 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.3 This standard does not purport to address all of t
5、hesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 412 Test Methods for Vul
6、canized Rubber and Thermo-plastic Rubbers and Thermoplastic ElastomersTensionD 573 Test Method for RubberDeterioration in an AirOvenD 1349 Practice for RubberStandard Temperatures forTestingD 3182 Practice for RubberMaterials, Equipment, andProcedures for Mixing Standard Compounds and Prepar-ing Sta
7、ndard Vulcanized SheetsD 3183 Practice for RubberPreparation of Pieces for TestPurposes from ProductsD 4483 Practice for Evaluating Precision for Test MethodStandards in the Rubber and Carbon Black ManufacturingIndustries3. Summary of Test Methods3.1 Specimens of vulcanized rubber are exposed to the
8、deteriorating influence of air at specified elevated temperaturefor known periods of time, after which their physical propertiesare determined. These are compared with the properties deter-mined on the original specimens and the changes noted.3.2 Unless otherwise specified, the determination of thep
9、hysical properties shall be carried out in accordance with TestMethods D 412.3.3 Except as may be otherwise specified in this testmethod, the requirements of Practices D 3182 and D 3183 shallbe complied with and are made part of this test method.3.4 In case of conflict between the provisions of this
10、 testmethod and those of detailed specifications or test methods fora particular material, the latter shall take precedence.4. Significance and Use4.1 Rubber and rubber products must resist the deteriorationof physical properties with time caused by oxidative andthermal aging. With this test method,
11、 these characteristics maybe determined in a way that is free of some of the complica-tions inherent in community-type aging devices, that is wherenumerous compounds (specimens) are aged in the sameenclosure.4.2 The isolation of compound (specimens) by the use ofindividual circulating air test tube
12、enclosures prevents anycross contamination from volatile products and permits a morerepresentative assessment of aging performance.4.3 Please refer to the Annex in Test Method D 573 forimportant information on standard compounds used for preci-sion testing for accelerated test aging evaluation.5. Ap
13、paratus5.1 The apparatus for the heat aging shall consist of boro-silicate glass test tubes 38 mm (1.52 in.) in diameter and 300mm (12 in.) in length heated uniformly in suitable equipment1This test method is under the jurisdiction of ASTM Committee D11 on Rubberand is the direct responsibility of S
14、ubcommittee D11.15 on Degradation Tests.Current edition approved May 1, 2005. Published May 2005. Originallyapproved in 1946. Last previous edition approved in 1999 as D 865 99.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. F
15、or Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.such as an oil or water bath or metal block so arranged as tocomply w
16、ith the following requirements:5.1.1 No more than three specimens shall be used in eachtest tube, and all specimens in a single tube shall be from asingle compound.5.1.2 Provision shall be made for vertical suspension of thespecimens as near the bottom of the test tube as possiblewithout touching ea
17、ch other or the sides of the test tube duringthe test.Asuggested means for holding the specimens is shownin Fig. 1.5.1.3 The test tubes shall be provided with a tight-fittingcork or nonreactive composition stopper through which an inletand an outlet tube shall be placed as shown in Fig. 1.5.1.4 The
18、heating equipment shall be provided with athermostatic control that will maintain the temperature at thelocation of the specimens in the test tube within 1C (1.8F) ofthe prescribed temperature. If a liquid medium is used, suitablestirring or circulation shall be provided to assure uniformity oftempe
19、rature.5.1.5 The temperature should be automatically recordedover the entire test period using a temperature-measuringdevice capable of measuring at the specified temperaturewithin 61C. For apparatus not equipped with automaticrecording capabilities, temperature shall be measured withsufficient freq
20、uency to ascertain that the temperature limitsspecified in 10.1 are adhered to. A check of the actualtemperature within the test tube should be made by placing athermometer in the tube with the bulb in the location ordinarilyoccupied by the specimens and the stem extending through athird hole drille
21、d in the cork stopper.5.1.6 The lip of the test tube shall be within 50 mm (2 in.)of the heating medium during the test.5.1.7 When an oil bath is used, means shall be provided toremove oil fumes from the oil bath so that they will not enterthe inlet tube.6. Sampling6.1 The sample size shall be suffi
22、cient to allow for thedetermination of the original properties on three specimens andalso on three or more specimens for each exposure period ofthe test. At least 24 h must elapse between completion of thevulcanization of the samples and the start of the aging test.6.2 When minimum requirements are
23、specified, one test onthree dumbbells shall be considered sufficient. But if the resultsare below the specified requirements, two additional specimensshall be prepared from the original sample and tested. Shouldthe results of either of these tests be below the specifiedrequirements, the sample shall
24、 be considered to have failed tomeet the specifications.7. Test Specimens7.1 Prepare dumbbell-shaped specimens as described in theTest Methods D 412. These shall be considered standard. Theirform shall be such that no mechanical, chemical, or heattreatment will be required after exposure in the pres
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