ASTM_F_1939_-_15.pdf

Designation:F193915Standard Test Method forRadiant Heat Resistance of Flame Resistant ClothingMaterials with Continuous Heating1This standard is issued under the fixed designation F1939;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 rates the non-steady state thermalresistance or insulating characteristics of flame resistant cloth-ing materials subjected to a continuous,standardized radiantheat exposure.1.1.1 This test method is not applicable to clothing materialsthat are not flame resistant.NOTE1The determination of a clothing materials flame resistanceshall be made prior to testing and done in accordance with the applicableperformance standard,specification standard,or both,for the clothingmaterials end-use.1.1.2 This test method does not predict skin burn injuryfrom the standardized radiant heat exposure as it does notaccount for the thermal energy contained in the test specimenafter the exposure has ceased.NOTE2See Appendix X4 for additional information regarding thistest method and predicted skin burn injury.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 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: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)ofFabricE457 Test Method for Measuring Heat-Transfer Rate Usinga Thermal Capacitance(Slug)CalorimeterF1494 Terminology Relating to Protective Clothing2.2 ASTM Special Technical Publication:ASTM Report,“ASTM Research Program on Electric ArcTest Method Developments to Evaluate Protective Cloth-ing Fabric;ASTM F18.65.01 Testing Group Report on ArcTesting Analysis of the F1959 Standard Test Method-Phase I”ASTM Manual 12 Manual on the Use of Thermocouples inTemperature Measurement3.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.3.1.2 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).1This 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 1999.Last previous edition approved in 2008 as F1939-08.DOI:10.1520/F1939-15.2For 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 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 non-steady state thermal resistance,nin testing ofthermal protective materials,a quantity expressed as thetime-dependent difference between the incident and exitingthermal energy values normal to and across two definedparallel surfaces of an exposed thermal insulative material.3.1.9 radiant heat resistance(RHR),nin testing of ther-mal protective materials,the cumulative amount of thermalexposure energy identified by the intersection of the measuredtime-dependent heat transfer response through the subjectmaterial to a time-dependent,empirical performance curve,expressed as a rating or value;kJ/m2(cal/cm2).3.1.10 response to heat exposure,nin testing the thermalresistance of thermal protective materials,the observa