ASTM_D_6909_-_10_2016.pdf

Designation:D690910(Reapproved 2016)Standard Specification forHigh Temperature and Acid-Resistant FluorocarbonTerpolymer Elastomer1This standard is issued under the fixed designation D6909;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.1.Scope1.1 This specification covers requirements for the fluorocar-bon terpolymer elastomer used in the manufacture of expan-sion joints for use in coal-fired utilities and other hightemperature industrial applications in which corrosive fluegases are present.1.2 This specification is intended as a reference procedurefor evaluating the performance of these vulcanizates and canalso be used for quality assurance testing before release of a lotbased on agreement between supplier and purchaser.1.3 The values stated in SI units are to be regarded asstandard.The values given in parentheses are for informationonly.1.4 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 requirements prior to use.2.Referenced Documents2.1 ASTM Standards:2D297 Test Methods for Rubber ProductsChemical Analy-sisD412 Test Methods for Vulcanized Rubber and Thermoplas-tic ElastomersTensionD471 Test Method for Rubber PropertyEffect of LiquidsD573 Test Method for RubberDeterioration in an AirOvenD1765 Classification System for Carbon Blacks Used inRubber ProductsD2240 Test Method for Rubber PropertyDurometer Hard-ness3.Ordering Information3.1 The seller shall mention this specification number in allquotations and when acknowledging purchase order.4.Materials and Manufacture4.1 Material shall be based on 100%virgin fluoroelastomerterpolymer of at least 68%by weight of fluorine content.Thecompound shall contain no less than 70%by weight offluoroelastomer.The remaining 30%by weight shall becomprised of Medium Thermal(MT)carbon black,Classifi-cation N 990(in Classification D1765),as reinforcing filler.Nomineral fillers shall be used.The fluoroelastomer curative shallbe of the bisphenol(dihydroxy),or peroxide types.No amountof reprocessed fluoroelastomer scrap or nonfluoroelastomerpolymer is acceptable.4.2 As-received virgin fluroelastomer sampled in accor-dance with Section 6 shall be fully press-cured,typically for 20min at 150C(302F),but not post-cured.Other time/temperature conditions are acceptable providing they producevulcanizates that meet the property requirements.5.Physical Properties5.1 The mean value of the individual samples shall meet thephysical and chemical property requirements shown in Table 1.5.2 A sample shall be exposed to 260 6 3C(500 6 5F)for 70 6 0.5 h per Test Method D573 and conform with thefollowing property change requirements to determine dry heatresistance:Hardness Change10 pointsTensile Strength Change+50%maxElongation Ultimate225%minWeight Change7%max5.3 The material color shall be black.6.Sampling6.1 Sampling and testing shall be as follows:6.1.1 For acceptance tests,sufficient product shall be takenat random from each lot to perform all required tests.Thenumber of samples tested per lot shall be no less than three.1This specification is under the jurisdiction ofASTM Committee D11 on Rubberand is the direct responsibility of Subcommittee D11.37 on Coated Fabrics,RubberThreads and Seals.This specification was developed in cooperation with the FluidSealing Assocation(Specification FSA-DSJ-401-09).Current edition approved July 1,2016.Published August 2016.Originallyapproved in 2003.Last previous edition approved in 2010 as D6909 10.DOI:10.1520/D6909-10R16.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.1.2 ASTM International test specimens shall be preparedfrom the same batch of polymer/compound as the materialbeing supplied and shall be fully press-cured as specified in4.2.6.1.3 Alot is all compound processed in one continuous runand presented to the purchaser at one time.6.1.4 Abatch is the quantity of compound run through a millor mixer at one time.6.1.5 The seller shall use ingredients and manufacturingprocesses on specification test samples that are essentially thesame as those on the approved product.7.Number of Test and Retests7.1 Acceptance TestsThe seller of the expansion jointshall be responsible for checking the batch sample test results,confirming that the results are in accordance with thisspecification,and preparing the“Batch Test Certific