ASTM_G_124_-_10.pdf

Designation:G12410Standard Test Method forDetermining the Combustion Behavior of Metallic Materialsin Oxygen-Enriched Atmospheres1This standard is issued under the fixed designation G124;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 test apparatus and techniques todetermine the minimum test gas pressure and sample tempera-ture that supports self-sustained burning and the regression rateof the melting surface of a standardized sample of a metallicmaterial that has been ignited using a promoter.1.2 The data obtained from this test method are dependenton the precise test sample configuration and provide a basis forcomparing the burning characteristics of metallic materials.Nocriteria are implied for relating these data for the suitability ofa materials use in any actual system.1.3 Requirements for apparatus suitable for this test methodare given,as well as an example.The example is not requiredto be used.1.4 This test method is for gaseous oxygen or any mixtureof oxygen with inert diluents that will support burning,at anypressure or temperature within the capabilities of the apparatusused.1.5 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.6 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:2G63 Guide for Evaluating Nonmetallic Materials for Oxy-gen ServiceG88 Guide for Designing Systems for Oxygen ServiceG93 Practice for Cleaning Methods and Cleanliness Levelsfor Material and Equipment Used in Oxygen-EnrichedEnvironmentsG94 Guide for Evaluating Metals for Oxygen Service3.Terminology3.1 Definitions:3.1.1 burn length,nthe burn length is the length of thesample that has been consumed by combustion.3.1.1.1 DiscussionThe burn length is determined by sub-tracting the post-test sample length from the pretest samplelength(which does not include the promoter length or regionused by the test sample support.)3.1.2 flammable material,na material is defined in thisstandard as flammable if a standard rod sample burns morethan 3 cm(1.2 in.)above the promoter(1,2).33.1.3 highest no-burn pressure,nthe maximum gas pres-sure(at a specified oxygen concentration and fixed sampletemperature)at which a material does not burn more than 3 cm(1.2 in.)above the promoter in a minimum of five tests.3.1.4 highest no-burn temperature,nthe maximumsample temperature(at a specified oxygen concentration andpressure)at which a material does not burn more than 3 cm(1.2 in.)above the promoter in a minimum of 5 tests.3.1.5 igniter,na material used to ignite the promoter thatcan burn under an electrical influence,such as a small-diameterwire.3.1.6 lowest burn pressure,nthe minimum gas pressure(at a specified oxygen concentration and fixed sample tempera-ture)at which a material burns more than 3 cm(1.2 in.)abovethe promoter for one or more tests specimens.3.1.7 lowest burn temperature,nthe minimum sampletemperature(at a specified oxygen concentration and pressure)at which a material burns more than 3 cm(1.2 in.)above thepromoter for one or more tests specimens.1This test method is under the jurisdiction of ASTM Committee G04 onCompatibility and Sensitivity of Materials in Oxygen Enriched Atmospheres and isthe direct responsibility of Subcommittee G04.01 on Test Methods.Current edition approved Nov.1,2010.Published November 2010.Originallyapproved in 1994.Last previous edition approved in 2003 as G124 95(2003).DOI:10.1520/G0124-10.2For 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 boldface numbers in parentheses refer to a list of references at the end ofthis standard.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.8 promoter,nan optional material that can add supple-mental heat and increase the temperature to start burning of themetallic material being tested.3.1.9 regression rate of the melting interface,nthe aver-age rate at which the solid-liquid metal(melting)interfaceadvances along the test sample length during a test.3.1.10 sample temperature,nthe initial temperature of thetest sample being evaluated.3.1.10.1 DiscussionVarious methods of measuring sampletemperatures are used.The method selected must be reportedwith test data.3.1.11 standard rod test sample,na 3.2 mm(0.125 in.)diam