ASTM_D_5668_-_21.pdf

Designation:D566821Standard Test Methods forRubber From Synthetic SourcesVolatile Matter1This standard is issued under the fixed designation D5668;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 These test methods cover a hot mill method,two ovenmethods,and a press method for the determination of moistureand other volatile matter content in synthetic rubber.1.2 Either oven method shall be used especially when therubber is too tacky to be handled satisfactorily on a hot mill.1.3 The press method shall be used for rubbers that are toocrumbly to be retained satisfactorily on a laboratory mill.1.4 The values stated in SI units are to be regarded as thestandard.The values in parentheses are for information only.1.5 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D3182 Practice for RubberMaterials,Equipment,and Pro-cedures for Mixing Standard Compounds and PreparingStandard Vulcanized SheetsD4483 Practice for Evaluating Precision for Test MethodStandards in the Rubber and Carbon Black ManufacturingIndustriesE145 Specification for Gravity-Convection and Forced-Ventilation Ovens3.Significance and Use3.1 These test methods are mainly intended for refereepurposes but can also be used for quality control of rubberproduction.3.2 The amount of volatiles can affect processing and curecharacteristics of compounded rubber.4.Apparatus4.1 Mill,as described in Practice D3182.4.2 Oven,as described in Specification E145.4.3 Press,as described in Practice D3182.METHOD AHOT-MILL TEST METHOD5.Summary of Test Method5.1 A weighed sample of rubber is sheeted out on a heatedmill until all the volatile matter is driven off.The sample isweighed again and the percentage of volatile matter is calcu-lated.6.Procedure6.1 Weigh a test sample of at least 250 g to the nearest 0.1g.6.2 Pass the weighed sample repeatedly for 4 min through alaboratory mill maintained at 100 6 5C(212 6 9F)with thedistance between the rolls set at 0.50 6 0.05 mm(0.020 60.002 in.)as determined by a lead slug.Do not allow thesample to band,and take care to avoid any loss of sample.Weigh the sample to the nearest 0.1 g.Pass the sample throughthe mill for an additional 2 min and reweigh.If the weights atthe end of the 4-and 6-min periods are within 0.1 g,calculatethe volatile matter;if not,continue passing the sample throughthe mill for 2-min periods until the weight remains constantwithin 0.1 g.7.Calculation7.1 Calculate the percentage of volatile matter as follows:Volatile Matter,%5A 2 B!/A#3100(1)where:A=mass of original sample,g,andB=mass of sample after milling,g.1These test methods are under the jurisdiction of ASTM Committee D11 onRubber and Rubber-like Materials and are the direct responsibility of SubcommitteeD11.11 on Chemical Analysis.Current edition approved Dec.1,2021.Published January 2022.Originallyapproved in 1995.Last previous edition approved in 2019 as D5668 19.DOI:10.1520/D5668-21.2For 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 StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1?METHOD BOVEN TEST METHODLARGE TEST SPECIMEN8.Summary of Test Method8.1 A weighed sample of rubber is sheeted out on alaboratory mill,then placed in an oven and dried to constantweight.The difference in weight before and after drying iscalculated as volatile matter.9.Procedure9.1 Sheet out a sample(at least 250 g)of rubber on alaboratory mill with the distance between the rolls set at 0.506 0.05 mm(0.020 6 0.002 in.)with the temperature of the rollbeing no greater than 50C(122F).Pass the rubber twicebetween the rolls.9.2 Weigh the entire sheet to the nearest 0.1 g and place ina force