1、Designation: E970 14 An American National StandardStandard Test Method forCritical Radiant Flux of Exposed Attic Floor Insulation Usinga Radiant Heat Energy Source1This standard is issued under the fixed designation E970; the number immediately following the designation indicates the year oforiginal
2、 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 fire-test-response standard describes a procedurefor measuring
3、 the critical radiant flux of exposed attic floorinsulation subjected to a flaming ignition source in a gradedradiant heat energy environment in a test chamber. Thespecimen is any attic floor insulation. This test method is notapplicable to those insulations that melt or shrink away whenexposed to t
4、he radiant heat energy environment or the pilotburner.1.2 This fire-test-response standard measures the criticalradiant flux at the point at which the flame advances thefarthest. It provides a basis for estimating one aspect of fireexposure behavior for exposed attic floor insulation. Theimposed rad
5、iant flux simulates the thermal radiation levelslikely to impinge on the floors of attics whose upper surfacesare heated by the sun through the roof or by flames from anincidental fire in the attic. This fire-test-response standard wasdeveloped to simulate an important fire exposure component offire
6、s that develop in attics, but is not intended for use inestimating flame spread behavior of insulation installed otherthan on the 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 The text of this standard referen
7、ces notes and footnotesthat provide explanatory information. These notes andfootnotes, excluding those in tables and figures, shall not beconsidered as requirements of this standard.1.5 This standard is used to measure and describe theresponse of materials, products, or assemblies to heat andflame u
8、nder 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 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It
9、 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.1.7 The text of this standard references notes and footnoteswhich provide explanatory material. These notes and footnotes(e
10、xcluding those in tables and figures) shall not be consideredas requirements of the standard.2. Referenced Documents2.1 ASTM Standards:2C167 Test Methods for Thickness and Density of Blanket orBatt Thermal InsulationsC665 Specification for Mineral-Fiber Blanket Thermal Insu-lation for Light Frame Co
11、nstruction and ManufacturedHousingC739 Specification for Cellulosic Fiber Loose-Fill ThermalInsulationC764 Specification for Mineral Fiber Loose-Fill ThermalInsulationE84 Test Method for Surface Burning Characteristics ofBuilding MaterialsE122 Practice for Calculating Sample Size to Estimate, WithSp
12、ecified Precision, the Average for a Characteristic of aLot or ProcessE176 Terminology of Fire StandardsE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE631 Terminology of Building ConstructionsE648 Test Method for Critical Radiant Flux of Floor-Covering Systems Using a Radi
13、ant Heat Energy SourceE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE2653 Practice for Conducting an Interlaboratory Study toDetermine Precision Estimates for a Fire Test Methodwith Fewer Than Six Participating Laboratories1This test method is under
14、the jurisdiction of ASTM Committee E05 on FireStandards and is the direct responsibility of Subcommittee E05.22 on SurfaceBurning.Current edition approved Jan. 1, 2014. Published February 2014. Originallyapproved in 1983. Last previous edition approved in 2010 as E970 10. DOI:10.1520/E0970-14.2For r
15、eferenced 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, W
16、est Conshohocken, PA 19428-2959. United States12.2 Federal Specifications:HH-I-515 Insulation Thermal (Loose Fill for Pneumatic orPoured Application), Cellulosic or Wood Fiber3HH-I-521, Insulation Blankets, Thermal (Mineral Fiber, forAmbient Temperature)3HH-I-1030 Insulation, Thermal (Mineral Fiber,
17、 for Pneu-matic or Poured Application)33. Terminology3.1 For definitions of terms used in this test method andassociated with fire issues refer to the terminology contained inTerminology E176.3.2 Definitions:3.2.1 attic, nan accessible enclosed space in a buildingimmediately below the roof and wholl
18、y or partly within theroof framing.3.2.2 See Terminology E631 for additional definitions ofterms used in this test method.3.3 Definitions of Terms Specific to This Standard:3.3.1 critical radiant flux, nthe level of incident radiantheat energy on the attic floor insulation system at the mostdistant
19、flame-out point. It is reported as W/cm2(or Btu/ft2s).3.3.2 radiant flux profile, nthe graph relating incidentradiant heat energy on the specimen plane to distance from thepoint of initiation of flaming ignition, that is, 0 mm.3.3.3 total flux metre, nthe instrument used to measure thelevel of radia
20、nt heat energy incident on the specimen plane atany point.4. Summary of Test Method4.1 A horizontally mounted insulation specimen is exposedto the heat from an air-gas radiant heat energy panel locatedabove and inclined at 30 6 5 to the specimen. After a shortpreheat, the hottest end of the specimen
21、 is ignited with a smallcalibrated flame. The distance to the farthest advance offlaming is measured, converted to kilowatts per square meterfrom a previously prepared radiant flux profile graph, andreported as the critical radiant flux.5. Significance and Use5.1 This fire-test-response standard is
22、designed to provide abasis for estimating one aspect of the fire exposure behavior toexposed insulation installed on the floors of building attics. Thetest environment is intended to simulate conditions that havebeen observed and defined in full-scale attic experiments.5.2 The test is intended to be
23、 suitable for regulatory statutes,specification acceptance, design purposes, or development andresearch.5.3 The fundamental assumption inherent in the test is thatcritical radiant flux is one measure of the surface burningcharacteristics of exposed insulation on floors or between joistsof attics.5.4
24、 The test is applicable to attic floor insulation specimensthat follow or simulate accepted installation practice.5.5 In this procedure, the specimens are subjected to one ormore specific sets of laboratory fire test exposure conditions. Ifdifferent test conditions are substituted or the anticipated
25、end-use conditions are changed, caution should be used topredict changes in the performance characteristics measured byor from this test. Therefore, the results are strictly valid onlyfor the fire test exposure conditions described in this procedure.5.5.1 If the test results obtained by this test me
26、thod are to beconsidered in the total assessment of fire hazard in a buildingstructure, then all pertinent established criteria for fire hazardassessment developed by Committee E-5 must be included inthe consideration.6. Apparatus6.1 The apparatus shall be as shown in Fig. 1, located in adraft-prote
27、cted laboratory that maintains a temperature from10.0 to 26.7C (50 to 80F) and a relative humidity from 30 to70 %:6.1.1 The radiant panel test chamber (Fig. 1 and Fig. 2) shallconsist of an enclosure 1400 mm (55 in.) long by 500 mm(1912 in.) deep by 710 mm (28 in.) above the test specimen.The sides,
28、 ends, and top shall be of 13-mm (12-in.) calciumsilicate, 740-kg/m3(46-lb/ft3) nominal density, insulating ma-terial with a thermal conductivity at 177C (350F) of 0.128W/(mK) (0.89 Btu in./(hft2F). One side shall be providedwith an approximately 100 by 1100 mm (4 by 44 in.) draft-tightfire-resistan
29、t glass window so that the entire length of the testspecimen is visible from outside the fire test chamber. On thesame side and below the observation window is a door which,when open, allows the specimen platform to be moved out formounting or removal of test specimens. At the low flux end ofthe cha
30、mber on the 500 mm side, a draft-tight fire-resistantwindow is permitted for additional observations.3Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http:/www.dodssp.daps.mil.NOTE 1All dimensions in millimetres. 1 in. =
31、25.4 mm.FIG. 1 Flooring Radiant Tester Schematic, Side ElevationE970 1426.1.2 The bottom of the test chamber shall consist of asliding steel platform which has provisions for rigidly securingthe test specimen holder in fixed and level position. The free,or air access, area around the platform shall
32、be in the rangefrom 0.2580 to 0.3225 m2(400 to 500 in.2).6.1.3 When the flame front advance is to be measured, ametal scale marked with 10 mm intervals shall be installed onthe back of the platform or on the back wall of the chamber.6.1.4 The top of the chamber shall have an exhaust stackwith interi
33、or dimensions of 102 6 3mm(46 0.13 in.) wideby 380 6 3 mm (15.00 6 0.13 in.) deep by 318 6 3mm(12.506 0.13 in.) high at the opposite end of the chamber fromthe radiant energy source.6.2 Radiant Heat Energy Source, a panel of porous materialmounted in a cast iron or steel frame, with a radiation surf
34、aceof 305 by 457 mm (12 by 18 in.). It shall be capable ofoperating at temperatures up to 816C (1500F). The panel fuelsystem shall consist of a venturi-type aspirator for mixing gas4and air at approximately atmospheric pressure, a clean dry airsupply capable of providing 28.3 m3/h (1000 f3t/h) at st
35、andardtemperature and pressure at 76 mm (3.0 in.) of water, andsuitable instrumentation for monitoring and controlling theflow of fuel to the panel.6.2.1 The radiant heat energy panel is mounted in thechamber at 30 6 5 to the horizontal specimen plane. Theradiant energy panel angle shall be adjusted
36、 to obtain the fluxprofile within the limits specified in accordance with 10.6. Thehorizontal distance from the 0 mark on the specimen fixture tothe bottom edge (projected) of the radiating surface of thepanel is 89 6 3 mm (3.5 6 0.13 in.). The panel-to-specimenvertical distance is 140 6 3 mm (5.5 6
37、 0.13 in.) (Fig. 1).6.2.2 Radiation Pyrometer for standardizing the thermaloutput of the panel, suitable for viewing a circular area 254 mm(10 in.) in diameter at a range of about 1.37 m (54 in.). It shallbe calibrated over the 460 to 510C (860 to 950F) operatingblackbody temperature range in accord
38、ance with the proceduredescribed in Annex A1.6.2.3 Voltmeter, high-impedance or potentiometric, with asuitable millivolt range shall be used to monitor the output ofthe radiation pyrometer described in 6.2.2.6.3 Dummy Specimen Holder (Fig. 3 and Fig. 4), con-structed from heat-resistant stainless st
39、eel (UNS N08330 (AISIType 330) or equivalent) having a thickness of 1.98 mm (0.078in.) and an overall dimension of 1140 by 320 mm (45 by 1234in.) with a specimen opening of 200 by 1000 mm (7.9 by 39.4in.). Six slots shall be cut in the flange on either side of theholder to reduce warping. The holder
40、 shall be fastened to theplatform with two stud bolts at each end.6.4 Dummy Specimen, used in the flux profiledetermination, made of 19-mm (34-in.) inorganic 740-kg/m3(46-lb/ft3) nominal density calcium silicate board (Fig. 3 andFig. 4). It is 250 mm (10 in.) wide by 1070 mm (42 in.) longwith 27-mm
41、(1116-in.) diameter holes centered on and alongthe centerline at the 100, 200, 300, ., 900, and 980-mmlocations measured from the maximum flux end of the speci-men.6.4.1 To provide proper and consistent seating of the fluxmeter in the hole openings, a stainless steel or galvanized steelbearing plate
42、 (Fig. 3 and Fig. 4) shall be mounted and firmly4Gas used in this test method shall be either commercial grade propane havinga heating value of approximately 83.1 MJ/m3(2500 Btu/ft3), or natural gas, orcommercial grade methane having a minimum purity of 96 %.NOTE 1All dimensions in millimetres. 1 in
43、. = 25.4 mm.FIG. 2 Flooring Radiant Panel Tester Schematic Low Flux End,ElevationNOTE 1All dimensions in millimetres. 1 in. = 25.4 mm.FIG. 3 Zero Reference Point Related to Detecting PlaneE970 143secured to the underside of the calcium silicate board withholes corresponding to those specified above.
44、 The bearing plateshall run the length of the dummy specimen board and have awidth of 76 mm (3.0 in.). The thickness of the bearing plateshall be set in order to maintain the flux meter height specifiedin 10.5. The maximum thickness of the bearing plate shall notexceed 3 mm (18 in.).6.5 Total Heat F
45、lux Transducer, to determine the flux profileof the chamber in conjunction with the dummy specimen (Fig.3), shall be of the Schmidt-Boelter5type, have a range from 0to 15 kW/m2(0 to 1.32 Btu/ft2s) and shall be calibrated overthe operating flux level range from 0.10 to 15 kW/m2inaccordance with the p
46、rocedure outlined in Annex A1. A sourceof 15 to 25C cooling water shall be provided for thisinstrument.6.5.1 Voltmeter, high-impedance or potentiometric, with arange from 0 to 10 mV and reading to 0.01 mV shall be usedto measure the output of the total heat flux transducer duringthe flux profile det
47、ermination.6.6 Specimen Tray (Fig. 5), constructed from 14-gage heat-resistant stainless steel (UNS-N08330 (AISI Type 330) orequivalent), thickness 1.98 mm (0.078 in.). The depth of thetray is 50 mm (2 in.). The flanges of the specimen tray aredrilled to accommodate two stud bolts at each end; the b
48、ottomsurface of the flange is 21 mm (0.83 in.) below the top edge ofthe specimen tray. The overall dimensions of the tray and thewidth of the flanges shall be such that the tray fills the openspace in the sliding platform. The tray must be adequate tocontain a specimen at least 1000 mm (40 in.) long
49、 and 250 mm(10 in.) wide. The zero reference point on the dummy specimenshall coincide with the pilot burner flame impingement point(Fig. 3).6.7 Pilot Burner, used to ignite the specimen, is a nominal 6mm (14 in.) inside diameter, 10 mm (38 in.) outside diameterstainless steel tube line burner having 19 evenly spaced 0.7 mm(0.028 in.) diameter (No. 70 drill) holes drilled radially alongthe centerline and 16 evenly spaced 0.7 mm (0.028 in.)diameter (No. 70 drill) holes drilled radially 60 below thecenterline (Fig. 6).6.7.1 In operation, the gas4fl
