ASTM_D_7029_-_17.pdf

Designation:D702917Standard Test Method forDetermination of Reactivity of Unsaturated Polyesters andVinyl Esters at 180.0F(82.2C)1This standard is issued under the fixed designation D7029;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 standard provides a standardized test method fordetermining the gelation and exotherm curve of unsaturatedpolyester and vinyl ester resins.This method provides guid-ance for measurement of the“Standard 180F(82.2C)Exo-therm Curve”along with information on potential variances ofthe measurement for some special resins.This test methodprovides information concerning the reactivity of unsaturatedpolyester and vinyl ester resins as they go through polymer-ization after mixing with the initiator.NOTE1There is no known ISO equivalent to this standard,althoughISO 584 is similar.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system are not necessarily equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems has the potential to result innonconformance with the standard.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.1.4 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:2D883 Terminology Relating to Plastics2.2 Society of Plastics Industry,Inc.:Handbook of Reinforced Plastics“Procedure for RunningExotherm Curves Using the Block Test Method”2.3 ISO Standard:ISO 584 Reinforced Plastics Based on Unsaturated PolyesterResinsDetermination of Reactivity at 80C33.Terminology3.1 DefinitionsFor definitions of terms that appear in thispractice relating to plastics,refer to Terminology D883.3.2 Definitions of Terms Specific to This Standard:3.2.1 gel timethe period of time in minutes and secondsrequired for the recording pyrometer to go from a temperaturebelow(usually 10 to 30F or 5.5 to 16C)bath temperature to10F(5.55C)above the bath temperature,typically 150F(65.5C)to 190F(78.8C)for a bath at 180F(82.2C).3.2.2 cure timethe period of time in minutes and secondsrequired for the recording pyrometer to go from a temperaturebelow(usually 10 to 30F or 5.5 to 16C)bath temperature tothe maximum temperature reading,typically 150F(65.5C)tothe maximum temperature for a bath at 180F(82.2C).3.2.3 interval timethe period of time in minutes andseconds required for the recording pyrometer to go from 10F(5.5C)above the bath temperature to the maximum tempera-ture reading,typically 190F(78.8C)to the maximum tem-perature.Thus,interval time is cure time minus gel time.3.2.4 peak exothermthe maximum temperature reachedduring the testing.3.2.5 recording pyrometera broad class of temperaturemeasuring devices including thermocouples with the ability forcontinuous temperature recording.3.2.6 initiatora compound that generates free radicals tostart the free radical polymerization of the unsaturated polyes-ter and vinyl ester resins.3.2.6.1 DiscussionAn initiator is typically a singleperoxide,but there are instances in which a combination ofinitiators is used.1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.18 on Reinforced Thermoset-ting Plastics.Current edition approved July 15,2017.Published August 2017.Originallyapproved in 2004.Last previous edition approved in 2009 as D7029-09.DOI:10.1520/D7029-17.2For 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.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036.*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.1 4.Summary of