ASTM_D_7309_-_21b.pdf

Designation:D730921bStandard Test Method forDetermining Flammability Characteristics of Plastics andOther Solid Materials Using Microscale CombustionCalorimetry1This standard is issued under the fixed designation D7309;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,which is similar to thermal analysistechniques,establishes a procedure for determining flamma-bility characteristics of combustible materials such as plastics.1.2 The test is conducted in a laboratory environment usingcontrolled heating of milligram specimens and complete ther-mal oxidation of the specimen gases.1.3 Specimens of known mass are thermally decomposed inan oxygen-free(anaerobic)or oxidizing(aerobic)environmentat a constant heating rate between 0.2 and 2 K/s.1.4 The heat released by the specimen is determined fromthe mass of oxygen consumed to completely oxidize(combust)the specimen gases.1.5 The rate of heat released by combustion of the specimengases produced during controlled thermal or thermoxidativedecomposition of the specimen is computed from the rate ofoxygen consumption.1.6 The specimen temperatures over which combustion heatis released are measured.1.7 The mass of specimen remaining after the test ismeasured and used to compute the residual mass fraction.1.8 The specimen shall be a material or composite materialin any form(fiber,film,powder,pellet,droplet).This testmethod has been developed to facilitate material developmentand research.1.9 This standard is used to measure and describe theresponse of materials,products,or assemblies to heat andflame under controlled conditions,but does not by itselfincorporate all factors required for fire hazard or fire riskassessment of the materials,products,or assemblies underactual fire conditions.1.10 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.NOTE1There is no known ISO equivalent to this test method.1.11 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 PlasticsD5865 Test Method for Gross Calorific Value of Coal andCokeE176 Terminology of Fire StandardsE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE456 Terminology Relating to Quality and StatisticsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE967 Test Method for Temperature Calibration of Differen-tial Scanning Calorimeters and Differential Thermal Ana-lyzersE1591 Guide for Obtaining Data for Fire Growth ModelsE2935 Practice for Evaluating Equivalence of Two TestingProcesses2.2 ISO Standard:ISO 13943 Fire SafetyVocabulary33.Terminology3.1 Definitions:1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.30 on Thermal Properties.Current edition approved Oct.1,2021.Published October 2021.Originallyapproved in 2007.Last previous edition approved in 2021 as D7309 21a.DOI:10.1520/D7309-21B.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,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.13.1.1 Terms used in this standard are defined in accordancewith Terminology D883,unless otherwise specified.For termsrelating to precision and bias and associated issues,the termsused in this standard are defined in accordance with Terminol-ogy E456.For terms relating to fire,the terms in this standardare defined in accordance with Terminology E176 andISO 13943.In case of conflict,the definitions given in Termi-nology E176 shall pre