ASTM_F_2702_-_15.pdf

Designation:F270215Standard Test Method forRadiant Heat Performance of Flame Resistant ClothingMaterials with Burn Injury Prediction1This standard is issued under the fixed designation F2702;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 measures thermal protective character-istics of flame resistant textile materials subjected to a stan-dardized radiant heat exposure relative to a predicted second-degree skin burn injury.1.1.1 This test method is not applicable to textile materialsthat are not flame resistant.NOTE1The determination of a textile materials flame resistance shallbe made prior to testing and done according to the applicable performanceor specification standard,or both,for the textile materials end-use.1.1.2 This test method accounts for the thermal energycontained in an exposed test specimen after the standardizedradiant heat exposure has ceased.1.2 This test method is used to measure and describe theresponse of materials,products,or assemblies to heat undercontrolled conditions,but does not by itself incorporate allfactors required for fire hazard or fire risk assessment of thematerials,products,or assemblies under actual fire conditions.1.3 The values stated in SI units are to be regarded asstandard.The values given in parentheses are mathematicalconversions to inch-pound or other units that are commonlyused for thermal testing.1.4 This standard does not purport to address the safetyconcerns,if any,associated with its use.It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D123 Terminology Relating to TextilesD1776 Practice for Conditioning and Testing TextilesD1777 Test Method for Thickness of Textile MaterialsD3776 Test Methods for Mass Per Unit Area(Weight)ofFabricD4157 Test Method for Abrasion Resistance of TextileFabrics(Oscillatory Cylinder Method)E457 Test Method for Measuring Heat-Transfer Rate Usinga Thermal Capacitance(Slug)CalorimeterF1494 Terminology Relating to Protective Clothing2.2 Other Standards:CCC-C-419 FederalSpecificationforCloth,Duck,Unbleached,Plied-Yarns,Army and Numbered3.Terminology3.1 Definitions:3.1.1 break-open,nintestingthermalprotectivematerials,a material response evidenced by the formation of ahole in the test specimen during the thermal exposure that mayresult in the exposure energy in direct contact with the heatsensor.3.1.1.1 DiscussionThe specimen is considered to exhibitbreakopen when a hole is produced as a result of the thermalexposure that is at least 3.2 cm2(0.5 in.2)in area or at least 2.5cm(1.0 in.)in any dimension.Single threads across theopening or hole do not reduce the size of the hole for thepurposes of this test method.3.1.2 charring,nthe formation of a carbonaceous residueas the result of pyrolysis or incomplete combustion.3.1.3 dripping,na material response evidenced by flowingof the polymer.3.1.4 embrittlement,nthe formation of a brittle residue asa result of pyrolysis or incomplete combustion.3.1.5 heat flux,nthe thermal intensity indicated by theamount of energy transmitted divided by area and time;kW/m2(cal/cm2s).3.1.6 ignition,nthe initiation of combustion.3.1.7 melting,na material response evidenced by soften-ing of the polymer.3.1.8 radiant heat performance(RHP),nin testing ofthermal protective materials,the cumulative amount of trans-ferred energy identified by the intersection of a measured1This test method is under the jurisdiction ofASTM Committee F23 on PersonalProtective Clothing and Equipment and is the direct responsibility of SubcommitteeF23.80 on Flame and Thermal.Current edition approved Feb.1,2015.Published February 2015.Originallyapproved in 2008.Last previous edition approved in 2008 as F2702 08.DOI:10.1520/F2702-15.2For 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 States1 time-dependent heat transfer response through a subject mate-rial to a time-dependent,empirical predicted second-degreeskin burn injury performance curve3,expressed as a rating orvalue;J/cm2(cal/cm2).3.1.9 response to heat exposure,nin testing of thermalprotective materials,the observable response of the textile tothe energy exposure as indicated by break-open,melting,dripping,charring,embrittlement,shrinkage,sticking,andignition.3.1.10 second-degree burn injury,nin testing of thermalprotective materials,reversible burn damage at the epider