ASTM D572-2004(2015) Standard Test Method for Rubber&x2014 Deterioration by Heat and Oxygen《使用加热法和氧化法测定橡胶劣化的标准试验方法》.pdf
《ASTM D572-2004(2015) Standard Test Method for Rubber&x2014 Deterioration by Heat and Oxygen《使用加热法和氧化法测定橡胶劣化的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D572-2004(2015) Standard Test Method for Rubber&x2014 Deterioration by Heat and Oxygen《使用加热法和氧化法测定橡胶劣化的标准试验方法》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D572 04 (Reapproved 2015)Standard Test Method forRubberDeterioration by Heat and Oxygen1This standard is issued under the fixed designation D572; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revisio
2、n. 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 U.S. Department of Defense.1. Scope1.1 This test method covers a procedure to deter
3、mine therelative deterioration resistance of vulcanized rubber in a hightemperature and high pressure oxygen environment. There maybe no exact correlation between this accelerated test andnatural aging of rubber because of the varied conditions ofnatural aging. This accelerated test is suitable for
4、laboratorycompound or product comparisons.NOTE 1For evaluating rubber vulcanizates under less severe condi-tions more nearly approaching natural aging, the use of Test MethodsD573 and D865 is recommended.1.2 The values stated in SI units are to be regarded as thestandard. The values given in parenth
5、eses are for informationonly.1.3 This standard does not purport to address all of thesafety 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
6、 prior to use. (For specificprecautionary statement, see Note 2.)2. Referenced Documents2.1 ASTM Standards:2D15 Method of Compound and Sample Preparation forPhysical Testing of Rubber Products (Withdrawn 1975)3D412 Test Methods for Vulcanized Rubber and Thermoplas-tic ElastomersTensionD454 Test Meth
7、od for Rubber Deterioration by Heat and AirPressureD573 Test Method for RubberDeterioration in an AirOvenD865 Test Method for RubberDeterioration by Heating inAir (Test Tube Enclosure)D3182 Practice for RubberMaterials, Equipment, and Pro-cedures for Mixing Standard Compounds and PreparingStandard V
8、ulcanized 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 Method3.1 Specimens of vulcanized rubber are exposed to a dete-riorat
9、ing influence at a specified elevated temperature andoxygen pressure for known periods of time, after which theirphysical properties are determined. These are compared withthe properties determined on the original specimens and thechanges noted.3.2 Unless otherwise specified, the determination of th
10、ephysical properties shall be carried out in accordance with TestMethods 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 the provisions of this
11、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. This test method provid
12、es a way to assess theseperformance characteristics of rubber, under certain acceler-ated conditions as specified.4.2 Please refer to the Annex in Test Method D573 forimportant information on standard compounds used for preci-sion testing for accelerated test aging evaluation.5. Oxygen-Pressure Vess
13、elNOTE 2Caution: Adequate safety provisions are important whenheating oxidizable organic materials in oxygen since the rate of reactionmay become very rapid in some cases, particularly if large surface area is1This test method is under the jurisdiction of ASTM Committee D11 on Rubberand is the direc
14、t responsibility of Subcommittee D11.15 on Degradation Tests.Current edition approved July 1, 2015. Published October 2015. Originallyapproved in 1940. Last previous edition approved in 2010 as D572 04 (2010).DOI: 10.1520/D0572-04R15.2For referenced ASTM standards, visit the ASTM website, www.astm.o
15、rg, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International, 100 Barr Harb
16、or Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1exposed, and very high pressures may be developed. If the sameequipment is used for the oxygen-pressure test and the air-pressure heattest, Test Method D454, care must be exercised to see that the thermostaticcontrols are properl
17、y set, since the specimens may react very rapidly withoxygen at the temperature of the air-pressure heat test. Liquids acceptableas heating media for one test may be hazardous when used for the othertest.5.1 The oxygen-pressure chamber shall consist of a metalvessel designed to retain an internal at
18、mosphere of oxygen gasunder pressure, with provisions for placing rubber specimenswithin it and subjecting the whole to controlled uniformtemperature. Because of the superior temperature control andheat transfer, metal vessels completely immersed in a liquidmedium are recommended for purposes of ref
19、eree tests. Theapparatus shall conform to the following requirements:5.1.1 The size of the chamber shall be optional but shall besuch that the specimens may be suspended therein verticallywithout undue crowding and without touching each other or thesides of the chamber.5.1.2 The source of heat is op
20、tional but shall be locatedoutside of the aging chamber proper.5.1.3 The heating medium is optional. Water, air, or otherfluids known to be safe in the presence of oxygen may be used.Water has an advantage because of its rapid heat transfer andnoncombustible nature. If air is used, the heated air sh
21、all bethoroughly circulated by means of mechanical agitation, andbaffles shall be used as required to prevent local overheatingand dead spots. Oils or other combustible fluids are extremelyhazardous in the presence of oxygen and should not be used asheating media for this test.5.1.4 Automatic temper
22、ature control of the heating mediumby means of thermostatic regulation shall be used. The regu-lation system shall be provided with power failure protectionand over-shoot protection to prevent accidental runaway tem-perature increase.5.1.5 The temperature should be automatically recordedover the ent
23、ire test period using a temperature-measuringdevice capable of measuring at the specific temperature towithin 61C. For apparatus not equipped with automaticrecording capabilities, temperature shall be measured withsufficient frequency to ascertain that the temperature limitsspecified in 10.2 are adh
24、ered to. If the pressure chamber iscompletely immersed, the temperature may be taken as that ofthe heating medium. The sensitive element of the temperature-measuring device shall be close to the pressure chamber but nottouching it. If the pressure chamber is not completely im-mersed in the heating m
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