1、Designation:F270008(Reapproved 2013)Standard Test Method forUnsteady-State Heat Transfer Evaluation of Flame ResistantMaterials for Clothing with Continuous Heating1This standard is issued under the fixed designation F2700;the number immediately following the designation indicates the year oforigina
2、l 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 the non-steady state heattransfer through flame
3、 resistant materials for clothing subjectedto a continuous,combined convective and radiant heat expo-sure.1.1.1 This test method is not applicable to materials that arenot flame resistant.NOTE1The determination of a materials flame resistance shall bemade prior to testing and done according to the a
4、pplicable performance orspecification standard,or both,for the materials end-use.1.1.2 This test method does not predict a materials skinburn injury performance from the specified thermal energyexposure.It does not account for the thermal energy containedin the test specimen after the exposure has c
5、eased.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 require
6、d 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 tes
7、ting.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.
8、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)Ca
9、lorimeterF1494 Terminology Relating to Protective ClothingF2703 Test Method for Unsteady-State Heat Transfer Evalu-ation of Flame Resistant Materials for Clothing with BurnInjury Prediction3.Terminology3.1 Definitions:3.1.1 breakopen,nin testing thermal protective materials,a material response evide
10、nced by the formation of a hole in thetest specimen during the thermal exposure that may result inthe exposure energy in direct contact with the heat sensor.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.
11、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,
12、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.1This test method is under the jurisdiction ofASTM Committee F23 on PersonalProtective Clothing and Equipment and is the direct responsibil
13、ity of SubcommitteeF23.80 on Flame and Thermal.Current edition approved June 1,2013.Published June 2013.Originallyapproved in 2008.Last previous edition approved in 2008 as F2700-08.DOI:10.1520/F2700-08R13.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Ser
14、vice 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 3.1.5heat flux,nthe thermal intensity indicated by
15、 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 unsteady state heat transfer value,nin testing ofthermal protective materials,a quantity expressed as
16、 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 heat transfer performance value(HTP),nin testingof thermal protective materials,the cumulative amount ofenergy identified by the intersection of the measured time-dependent heat transfer response through the subject materialto a time-dependent,empirical performance curve,expressedas a rating or value;J/cm2(cal/cm2).3
