ASTM_D_1414_-_15.pdf

Designation:D141415Standard Test Methods forRubber O-Rings1This standard is issued under the fixed designation D1414;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.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 These test methods describe the procedures for deter-mining the physical properties of O-rings and changes in theseproperties due to aging.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 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:2D297 Test Methods for Rubber ProductsChemical Analy-sisD395 Test Methods for Rubber PropertyCompression SetD412 Test Methods for Vulcanized Rubber and Thermoplas-tic ElastomersTensionD471 Test Method for Rubber PropertyEffect of LiquidsD573 Test Method for RubberDeterioration in an AirOvenD865 Test Method for RubberDeterioration by Heating inAir(Test Tube Enclosure)D1329 Test Method for Evaluating Rubber PropertyRetraction at Lower Temperatures(TR Test)D1415 Test Method for Rubber PropertyInternationalHardnessD2240 Test Method for Rubber PropertyDurometer Hard-nessD3767 Practice for RubberMeasurement of DimensionsD4483 Practice for Evaluating Precision for Test MethodStandards in the Rubber and Carbon Black ManufacturingIndustriesE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 Aerospace Standard:AS568A Oring Sizes33.Terminology3.1 Definitions:3.1.1 O-ringa rubber seal of homogeneous compositionmolded in one piece to the configuration of a torus with circularcross section.The O-ring is used as a dynamic or static sealusually installed in a machined groove.4.Significance and Use4.1 These test methods provide acceptable procedures forquality control purposes and for the determination of engineer-ing characteristics.5.General Methods5.1 Except as otherwise specified in these test methods forrubber O-rings,the followingASTM test methods applicable ingeneral to vulcanized rubber,shall be complied with asrequired and are hereby made a part of these test methods:5.1.1 Tension TestTest Methods D412.5.1.2 Compression SetTest Methods D395.5.1.3 Low TemperatureTest Method D1329.5.1.4 DensityTest Methods D297.5.1.5 Fluid AgingTest Method D471.5.1.6 Heat AgingTest Methods D865 and D573.5.1.7 HardnessTest Methods D2240 and D1415.5.2 In case of conflict between the provisions of these testmethods and those of detailed procedures herein,the lattershall take precedence.6.Test Conditions6.1 The temperature of the testing room shall be 23 6 2C(73.4 6 3.6F).The specimens to be tested shall be kept in this1These test methods are under the jurisdiction of ASTM Committee D11 onRubber and are the direct responsibility of Subcommittee D11.37 on Coated Fabrics,Rubber Threads and Seals.Current edition approved July 1,2015.Published September 2015.Originallyapproved in 1956.Last previous edition approved in 2013 as D1414 94(2013).DOI:10.1520/D1414-15.2For 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 standards Document Summary page onthe ASTM website.3Standardization Documents Order Desk,Bldg.4 Section D,700 Robbins Ave.,Philadelphia,PA 19111-5094,Attn:NPODS.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 room for a minimum of 30 min previous to the time of testing.For referee tests the minimum time for conditioning shall be 16h.In cases where this temperature cannot be obtained,theactual temperature shall be reported.7.Dimensional Measurements7.1 Thickness:7.1.1 The thickness or cross section shall be measured by amicrometer in accordance with Practice D3767,Procedure A.7.1.2 The O-ring specimen shall be measured at four pointsequally distributed around the circumference in both the radialand axial direction.An average reading shall be used forcalculation.7.2 DiameterA stepped cone or optical comparator maybe used for measuring the inside diameter of small rings.Thediametric intervals of the stepped cone shall not exceed 2%ofthe diameter to be measured(see Fig.1).8.Tension Testing8.1 Testing Machine The testing machine shall conform tothe requirements specified in Section 3 of Test Methods D412,with the exception of the grips.Grips for testing rings shallconsist of ball-bearing spools at least 9 mm(0.35 in.)indiameter,and