ASTM D865-2011 Standard Test Method for RubberDeterioration by Heating in Air (Test Tube Enclosure)《在空气中加热橡胶劣化(试管封闭)的标准试验方法》.pdf
《ASTM D865-2011 Standard Test Method for RubberDeterioration by Heating in Air (Test Tube Enclosure)《在空气中加热橡胶劣化(试管封闭)的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D865-2011 Standard Test Method for RubberDeterioration by Heating in Air (Test Tube Enclosure)《在空气中加热橡胶劣化(试管封闭)的标准试验方法》.pdf(5页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D865 11Standard Test Method forRubberDeterioration by Heating in Air (Test TubeEnclosure)1This standard is issued under the fixed designation D865; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revis
2、ion. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () 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 procedure to determin
3、e 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 compounds (specimens
4、). 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 thesafety concerns, if
5、 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:2D412 Test Methods for Vulcanized Rubber and The
6、rmo-plastic ElastomersTensionD573 Test Method for RubberDeterioration in an AirOvenD1349 Practice for RubberStandard Temperatures forTestingD2240 Test Method for Rubber PropertyDurometerHardnessD3182 Practice for RubberMaterials, Equipment, andProcedures for Mixing Standard Compounds and Prepar-ing
7、Standard Vulcanized SheetsD3183 Practice for RubberPreparation of Pieces for TestPurposes from ProductsD4483 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 th
8、edeteriorating 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 unexposed specimens and the changesnoted.3.2 Unless otherwise specified, the determinati
9、on of thephysical properties shall be carried out in accordance with testmethods in Test Methods D412.3.3 Except as may be otherwise specified in this testmethod, the requirements of Practices D3182 and D3183 shallbe complied with and are made part of this test method.3.4 In case of conflict between
10、 the provisions of this testmethod and those of detailed specifications or test methods fora particular material, the latter shall take precedence or ifotherwise agreed upon between customer and supplier orbetween laboratories.4. Significance and Use4.1 Rubber and rubber products must resist the det
11、eriorationof physical properties with time caused by oxidative andthermal ageing. This test method determines these character-istics in a way that is free of some of the complications inherentin community-type ageing devices, that is where numerouscompounds (specimens) are aged in the same enclosure
12、.4.2 The isolation of compounds (specimens) by the use ofindividual circulating air test tube enclosures prevents crosscontamination from volatile products and permits a morerepresentative assessment of ageing performance.4.3 Please refer to the Annex in Test Method D573 forimportant information on
13、standard compounds used for preci-sion testing for accelerated test ageing evaluation.1This test method is under the jurisdiction of ASTM Committee D11 on Rubberand is the direct responsibility of Subcommittee D11.15 on Degradation Tests.Current edition approved Aug. 15, 2011. Published September 20
14、11. Originallyapproved in 1946. Last previous edition approved in 2005 as D865 99 (2005).DOI: 10.1520/D0865-11.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the s
15、tandards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5. Apparatus5.1 The apparatus for heat ageing shall consist of borosili-cate glass test tubes 38 mm (1.52 in.) in diameter and 300 mm(1
16、2 in.) in length heated uniformly in suitable equipment suchas an oil or water bath or metal block (see Fig. 1) so arrangedas to comply with the following requirements:5.1.1 No more than three specimens shall be exposed ineach test tube, and all specimens in a single tube shall be froma single compo
17、und.5.1.2 Provisions shall be made for vertical suspension of thespecimens as near the bottom of the test tube as possiblewithout touching each other or the sides of the test tube duringthe test.Asuggested means for holding the specimens is shownin Fig. 2.5.1.3 The test tubes shall be provided with
18、a tight-fittingcork or nonreactive composition stopper through which an inletand an outlet tube shall be placed as shown in Fig. 2.5.1.4 The heating equipment shall be provided with athermostatic control that will maintain the temperature at thelocation of the specimens in the test tube within 61C(6
19、1.8F) of the prescribed temperature. If a liquid medium isused, suitable stirring or circulation shall be provided to assureuniformity of temperature.5.1.5 The temperature should be automatically recordedover the entire test period using a temperature-measuringdevice capable of measuring at the spec
20、ified temperaturewithin 61C (61.8F). Apparatus that is not equipped withautomatic recording capabilities, the temperature shall bemeasured with sufficient frequency to assure compliance withthe temperature limits specified in 10.1.5.1.6 Prior to commencing a test, or series of tests, a checkof the a
21、ctual temperature within the test tube shall be made byplacing a thermometer in the tube with the bulb in the locationordinarily occupied by the specimens. Alternatively, a digitaltemperature measuring device may be used in place of aliquid-in-glass thermometer, wherein the probe is placed in aposit
22、ion ordinarily occupied by the specimens. The thermom-eter or probe shall be inserted through either the tubes orthrough a third hole in the stopper which shall be securelyclosed during the test.5.1.7 The lip of the test tube shall be within 50 mm (2 in.)of the heating medium during the test.5.1.8 W
23、hen an oil bath is used, a means shall be provided toremove oil fumes from the oil bath, typically using a refluxcondenser, so that they will not enter the inlet tube.6. Sampling6.1 The sample size shall be sufficient to allow for thedetermination of the original properties on three unexposedspecime
24、ns and also on three or more specimens for eachexposure period of the test. At least 24 h must elapse betweencompletion of the vulcanization of the samples and the start ofthe ageing test.FIG. 1 A Typical Metal Block Type Ageing OvenABCDEFGmmin.30012115412150626510123811220341.5116FIG. 2 Arrangement
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
下载文档到电脑,查找使用更方便
10000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ASTMD8652011STANDARDTESTMETHODFORRUBBERDETERIORATIONBYHEATINGINAIRTESTTUBEENCLOSURE 空气 加热 橡胶 试管 封闭 标准
链接地址:http://www.mydoc123.com/p-512351.html