ASTM_D_3795_-_20.pdf

Designation:D379520Standard Test Method forThermal Flow,Cure,and Behavior Properties of PourableThermosetting Materials by Torque Rheometer1This standard is issued under the fixed designation D3795;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.Scope*1.1 This test method covers the apparatus,and a specific testmethod,including the evaluation of results required for thedetermination of the thermal flow and cure behavior propertiesof pourable thermosetting materials.1.2 This test method can be used:1.2.1 As a control for the development and production ofpourable thermosetting materials and to measure the differentproperties(for example,melting behavior,cure behavior,etc.)as well as the influence of various additives and fillers in anygiven formulations,and1.2.2 Verify the uniformity of different production batchesof the same formulation.1.3 The values are stated in SI units.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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.Specific precautions are given in Section 7.NOTE1This standard is equivalent to the inactive ISO 15062.Thisstandard and ISO 15252-2 address the same subject matter,but differ intechnical content.1.5 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:2D792 Test Methods for Density and Specific Gravity(Rela-tive Density)of Plastics by DisplacementD883 Terminology Relating to PlasticsD1898 Practice for Sampling of Plastics(Withdrawn 1998)3E691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 ISO Standards:4ISO 15062 PlasticsDetermination of the thermal-flow andcure behaviour of thermosetting materials by torque rhe-ometryISO 15252-2 PlasticsEpoxy Powder Moulding Com-pounds(EP-PMCs)Part 2:Preparation of Test Speci-mens And Determination of Properties3.Terminology3.1 DefinitionsFor definitions of terms used in this testmethod and associated with plastics issues refer to the termi-nology contained in Terminology D883.3.2 Definitions of Terms Specific to This Standard:3.2.1 For the purpose of this test method,the followingdefinitions apply,(see Fig.1):3.2.2 flow and cure behaviorthe flow behavior is repre-sented by the recorded torque curve from the loading peak(Point t1),to the torque minimum(Point t5).The cure behavioris represented by the recorded torque curve from the torqueminimum(Point t5)to the torque maximum(Point t4).The rateof curing is represented by the slope of the torque curve.3.2.3 timethe residence time at torque t5 X,where X is afactor(preferably 1.3)is tv(s).To determine tv,draw a line att5 X parallel with the time axis.The intersection of this linewith the left branch of the curve is t2.The intersection of thisline with the right branch of the curve is t3:1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.30 on Thermal Proper-ties.30.08).Current edition approved April 1,2020.Published April 2020.Originallyapproved in 1979.Last previous edition approved in 2012 as D3795 00a(2012).DOI:10.1520/D3795-20.2For 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.4Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.*A Summary of Changes section appears at the end of this standardCopyright 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.tv5 t32 t2units are secondss!(1)3.2.3.1 DiscussionDepending on the manufacturer of theequipment,the software analysis program for the designatedvalues in this test method may differ(t1,t2,etc.).3.2.3.2 DiscussionUpon agreement between interestedparties,the value of X m