1、Designation:E274915aAn American National StandardStandard Practice forMeasuring the Uniformity of Furnace Exposure on TestSpecimens1This standard is issued under the fixed designation E2749;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revi
2、sion,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 standard provides general principles for measuringthe uniformity of the furnace exposure on specimens
3、 tested inaccordance with Test Methods E119,E814,E1529,E1725,E1966 and E2336.1.2 This practice specifies the materials and the constructionrequirements for a standardized test specimen used to providea mounting surface for the instrumentation that measuresfurnace exposure.1.3 The instrumentation rec
4、ords temperatures,pressure dif-ferentials and oxygen content near the surface of the testspecimen.1.4 The values stated in SI units are to be regarded as thestandard.The units given in parentheses are for informationonly.1.5 This standard is used to measure and describe theresponse of materials,prod
5、ucts,or assemblies to heat andflame under controlled conditions,but does not by itselfincorporate all factors required for fire hazard or fire riskassessment of the materials,products,or assemblies underactual fire conditions.1.6 Fire testing is inherently hazardous.Adequate safe-guards for personne
6、l and property shall be employed inconducting these tests.1.7 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
7、 of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C1396/C1396M Specification for Gypsum BoardE119 Test Methods for Fire Tests of Building Constructionand MaterialsE176 Terminology of Fire StandardsE814 Test Method for Fire Tests of Penetration FirestopSystemsE1529 Tes
8、t Methods for Determining Effects of Large Hy-drocarbon Pool Fires on Structural Members and Assem-bliesE1725 Test Methods for Fire Tests of Fire-Resistive BarrierSystems for Electrical System ComponentsE1966 Test Method for Fire-Resistive Joint SystemsE2336 Test Methods for Fire Resistive Grease Du
9、ct Enclo-sure Systems2.2 ISO Technical Report:ISO/TR 834-2 Fire resistance tests Elements of buildingconstruction Part 2:Guide on measuring uniformity offurnace exposure on test samples3.Terminology3.1 DefinitionsFor definitions of terms used in thispractice,refer to Terminology E176.3.2 Definitions
10、 of Terms Specific to This Standard:3.2.1 effective area of the furnace openingfurnace open-ing within the boundaries of the monitoring instrumentation.4.Summary of Practice4.1 This practice consists of preparing a standardized testspecimen to represent test specimens described in Test Meth-ods E119
11、,E814,E1529,E1725,E1966 and E2336.The1This practice is under the jurisdiction of ASTM Committee E05 on FireStandards and is the direct responsibility of Subcommittee E05.11 on FireResistance.Current edition approved June 1,2015.Published July 2015.Originally approvedin 2010.Last previous edition app
12、roved in 2015 as E2749-15.DOI:10.1520/E2749-15A.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 Int
13、ernational,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 standardized test specimen provides a low cost,easily con-structed supporting construction for the mounting of instru-mentation that measures the exposure imposed by the furnaceonto test specimens.4.2 The sta
14、ndardized test specimen consists of two layers of15.9 mm(58in.)thick Type X gypsum board on the surfacefacing the furnace chamber attached to steel channels and asingle layer of structural panels(plywood or oriented strandboard)attached to the steel channels on the surface away fromthe furnace chamb
15、er.The gypsum board provides a fire-resistive surface for the mounting of the instrumentation.Thestructural panels provide stability for the steel support chan-nels.4.3 Instrumentation to measure the thermal impact due toexposure to the furnace upon the standardized test specimen isinstalled at vari
16、ous locations on the exposed surface of thestandardized test specimen.Probes used to gather air sampleswithin the furnace chamber are also installed.4.4 The standardized test specimen is exposed to the time-temperature curve specified in referenced ASTM fire teststandards for a time period of 45 min during which time dataare recorded by the instrumentation mounted on the standard-ized test specimen.4.5 The data provide a record of the conditions and unifor-mity of the furnace exposure upon stand