1、Designation:C148513Standard Test Method forCritical Radiant Flux of Exposed Attic Floor Insulation Usingan Electric Radiant Heat Energy Source1This standard is issued under the fixed designation C1485;the number immediately following the designation indicates the year oforiginal adoption or,in the c
2、ase 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 a procedure for measuring thecritical radiant flux of exposed attic flo
3、or insulation subjectedto a flaming ignition source in a graded radiant heat energyenvironment inside a test chamber.The test specimen can beany attic floor insulation.This test method is not applicable tothose insulations that melt or shrink away when exposed to theradiant heat energy environment o
4、r the ignition source.1.2 This test method measures the critical radiant flux at thefarthest point to which the flame advances.It provides a meansfor relative classification of a fire test response standard forexposed attic floor insulation.The imposed radiant flux simu-lation levels of thermal radi
5、ation are likely to impinge on thesurface of exposed attic insulation from roof assemblies heatedby the sun and by heat or flames of an incidental fire which hasthe potential to involve an attic space.This test method isintended to simulate an important element of fire exposure thathas the potential
6、 to develop in open attics,but is not intendedfor use in describing flame spread behavior of insulationinstalled other than on an attic floor.1.3 The values stated in SI units are to be regarded asstandard.The values given in parentheses are for informationonly.1.4 This standard is used to measure a
7、nd describe theresponse of materials,products,or assemblies to heat and flameunder controlled conditions,but does not by itself incorporateall factors required for fire hazard or fire risk assessment of thematerial,products,or assemblies under actual fire conditions.1.5 WarningFire testing is inhere
8、ntly hazardous.Ad-equate safeguards for personnel and property shall be em-ployed in conducting these tests.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
9、 health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C168 Terminology Relating to Thermal InsulationE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 ASTM Adjuncts:CRF(Cri
10、tical Radiant Flux)Calibration Form33.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this specification,seeTerminology C168.3.2 Definitions of Terms Specific to This Standard:3.2.1 critical radiant flux(CRF)the level of incidentradiant heat energy on the attic floor insulation sys
11、tem at themost distant flame-out point in W/cm.2(Btu/ft2s).3.2.2 flux profilethe curve relating incident radiant heatenergy on the specimen plane to distance from the point ofinitiation of flaming ignition,that is,0.0 cm.(0.0 in.).3.2.3 graded radiant energythe heating element is placedon an angled
12、plain.3.2.4 total flux meterthe instrument used to measure thelevel of radiant heat energy incident on the specimen plane ata given point.3.2.5 screedgently remove the excess material using ametal straight edge to leave a uniform surface on the insulationflush with the top of the container.4.Summary
13、 of Test Method4.1 A horizontally mounted insulation specimen is exposedto the heat from an electric radiant heat energy panel locatedabove and inclined at 30 to the specimen.After a short1This test method is under the jurisdiction ofASTM Committee C16 on ThermalInsulation and is the direct responsi
14、bility of Subcommittee C16.31 on Chemical andPhysical Properties.Current edition approved March 1,2013.Published March 2013.Originallyapproved in 2001.Last previous edition approved in 2006 as C148506.DOI:10.1520/C1485-13.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact A
15、STM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from ASTM International Headquarters.Order Adjunct No.ADJC1485.Original adjunct produced in 2006.Copyright ASTM International,100 Bar
16、r Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 preheat,the hottest end of the specimen is ignited with a smallflame.The distance to the farthest advance of flaming ismeasured,converted to watts per square centimeter from apreviously prepared graph of the radiant flux profile,andreported as the critical radiant flux.5.Significance and Use5.1 This test method is designed to provide a basis forestimating one aspect of the fire exposure behavior of exposedinsulation instal