ASTM_D_3855_-_84_2010.pdf

Designation:D385584(Reapproved 2010)Standard Test Method forRubber ThreadDeterioration Due to Standard WashingSolution Treatment1This standard is issued under the fixed designation D3855;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 test method covers the measurement of the relativedeterioration resistance of bare rubber threads subjected to astandard washing solution when they are dried at roomtemperature and heat aged.1.2 The results obtained by this test method are onlycomparative since it may not be possible to absolutely correlatesuch results with actual service life of the threads or of anarticle containing the threads.1.3 The values stated in SI units are to be regarded as thestandard.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of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D2433 Test Methods for Rubber Thread(Withdrawn 2012)3E145 Specification for Gravity-Convection and Forced-Ventilation Ovens3.Summary of Test Method3.1 The initial properties of the thread are determined by theappropriate test methods in accordance with Test MethodsD2433.The same test specimens,extended to 100%elonga-tion,are subjected to one cycle of washing,drying,andair-oven aging.3.2 The physical property measured in the test may be anyone of those described in Sections 18 to 37 of Test MethodsD2433;however,the most suitable are the Schwartz value(Section 25)or stress retention(Section 35).4.Significance and Use4.1 Rubber threads or garments containing rubber threadsare very often subjected to washing treatments that differconsiderably in the composition and temperature of the wash-ing solution used.Information on the composition of commer-cial detergents used is not readily available,and the same brandname may contain variations in composition.5.Apparatus5.1 Constant-Rate-Of-Extension(CRE)Type Tensile TestingMachine,with a load capacity from 0.1 to 20 N(10 to 2000 gf),equipped with hooks.5.2 Masonite and a Stainless Steel or Glass Form,ofsuitable dimensions to hold the thread loops elongated to100%.NOTE1If the Schwartz value is used,it is advisable to restrict themaximum massaging extension to 300%to avoid excessive specimenbreakage during massaging after aging.If the stress retention at 100%elongation is used,massage the thread to 300%extension for six cyclesimmediately before extending to the stress to be measured.5.2.1 FormA form,100 by 300 by 3 mm(4 by 12 by18in.),with the center section cut out as illustrated in Fig.1,andwith the outside edges rounded,is suitable for this purpose.5.3 Constant-Temperature Water Bath.5.4 Thermometer,with a range from 0 to 100C in 0.2Cdivisions.5.5 Circulating Hot-Air Oven,conforming to SpecificationE145,capable of maintaining a temperature of 125 6 2C.5.6 Beakers,1500-cm3.6.Standard Washing Solution6.1 The standard washing solution shall be prepared asfollows:6.1.1 Dissolve the following ingredients in 1 L of distilledwater:1This test method is under the jurisdiction of ASTM Committee D11 on Rubberand is the direct responsibility of Subcommittee D11.37 on Coated Fabrics,RubberThreads and Seals.Current edition approved May 1,2010.Published December 2010.Originallyapproved in 1979.Last previous edition approved in 2004 as D3855 84(2004).DOI:10.1520/D3855-84R10.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 dodecyl benzene sodium sulfonate1.0 ganhydrous sodium tripolyphosphate1.5 gsodium perborate0.5 gsodium silicate(Na2O:SiO2=1:2 anhydrous)0.5 ganhydrous sodium sulfate1.0 gcupric sulfate pentahydrate0.0086 g6.1.2 Within 1 h prior to the wash test,dissolve 2.0 g ofsodium perborate in 98.0 g of distilled water at room tempera-ture.Add 25 g of this solution to 975 g of the solutiondescribed in 6.1.1 heated to the wash temperature immediatelybefore immersing the specimens.6.2 Use 100 g of the standard wash solution for each gramof thread under test.When the amount of wash solution neededto cover the samples exceeds this ratio,add to the bath morethread of the same class to make up the deficiency.7.Test Specimens7.1 Prepare three test specimens from each sample ofrelaxed and conditi