1、Designation: E970 14E970 17 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 ofo
2、riginal 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. Scope Scope*1.1 This fire-test-response standard describes a procedur
3、e for measuring the critical radiant flux of exposed attic floor insulationsubjected to a flaming ignition source in a graded radiant heat energy environment in a test chamber. The specimen is any atticfloor insulation. This test method is not applicable to those insulations that melt or shrink away
4、 when exposed to the radiant heatenergy environment or the pilot burner.1.2 This fire-test-response standard measures the critical radiant flux at the point at which the flame advances the farthest. Itprovides a basis for estimating one aspect of fire exposure behavior for exposed attic floor insula
5、tion. The imposed radiant fluxsimulates the thermal radiation levels likely to impinge on the floors of attics whose upper surfaces are heated by the sun throughthe roof or by flames from an incidental fire in the attic. This fire-test-response standard was developed to simulate an importantfire exp
6、osure component of fires that develop in attics, but is not intended for use in estimating flame spread behavior of insulationinstalled other than on the attic floor.1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.1.4 The tex
7、t of this standard references notes and footnotes that provide explanatory information. These notes and footnotes,excluding those in tables and figures, shall not be considered as requirements of this standard.1.5 This standard is used to measure and describe the response of materials, products, or
8、assemblies to heat and flame undercontrolled conditions, but does not by itself incorporate all factors required for fire hazard or fire risk assessment of the materials,products, or assemblies under actual fire conditions.1.6 This standard does not purport to address all of the safety concerns, if
9、any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.1.7 The text of this standard references notes and footnotes which provide explanatory materia
10、l. These notes and footnotes(excluding those in tables and figures) shall not be considered as requirements of the standard.1.8 This international standard was developed in accordance with internationally recognized principles on standardizationestablished in the Decision on Principles for the Devel
11、opment of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2C167 Test Methods for Thickness and Density of Blanket or Batt Thermal InsulationsC665 Specification for Mineral-
12、Fiber Blanket Thermal Insulation for Light Frame Construction and Manufactured HousingC739 Specification for Cellulosic Fiber Loose-Fill Thermal InsulationC764 Specification for Mineral Fiber Loose-Fill Thermal InsulationE84 Test Method for Surface Burning Characteristics of Building MaterialsE122 P
13、ractice for Calculating Sample Size to Estimate, With Specified Precision, the Average for a Characteristic of a Lot orProcessE176 Terminology of Fire Standards1 This test method is under the jurisdiction of ASTM Committee E05 on Fire Standards and is the direct responsibility of Subcommittee E05.22
14、 on Surface Burning.Current edition approved Jan. 1, 2014July 1, 2017. Published February 2014July 2017. Originally approved in 1983. Last previous edition approved in 20102014 asE970 10. 14. DOI: 10.1520/E0970-14.10.1520/E0970-17.2 For referencedreferened ASTM standards, visit the ASTM website, www
15、.astm.org, or contact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of wh
16、at changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered th
17、e official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1E177 Practice for Use of the Terms Precision and Bias in ASTM Test MethodsE631 Terminology of Buildin
18、g ConstructionsE648 Test Method for Critical Radiant Flux of Floor-Covering Systems Using a Radiant Heat Energy SourceE691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test MethodE2653 Practice for Conducting an Interlaboratory Study to Determine Precision Estimat
19、es for a Fire Test Method with FewerThan Six Participating Laboratories2.2 Federal Specifications:HH-I-515 Insulation Thermal (Loose Fill for Pneumatic or Poured Application), Cellulosic or Wood Fiber3HH-I-521, Insulation Blankets, Thermal (Mineral Fiber, for Ambient Temperature)3HH-I-1030 Insulatio
20、n, Thermal (Mineral Fiber, for Pneumatic or Poured Application)33. Terminology3.1 For definitions of terms used in this test method and associated with fire issues refer to the terminology contained inTerminology E176.3.2 Definitions:3.2.1 attic, nan accessible enclosed space in a building immediate
21、ly below the roof and wholly or partly within the roofframing.3.2.2 See Terminology E631 for additional definitions of terms used in this test method.3.3 Definitions of Terms Specific to This Standard:3.3.1 critical radiant flux, nthe level of incident radiant heat energy on the attic floor insulati
22、on system at the most distantflame-out point. It is reported as W/cm2 (or Btu/ft2s).3.3.2 radiant flux profile, nthe graph relating incident radiant heat energy on the specimen plane to distance from the pointof initiation of flaming ignition, that is, 0 mm.3.3.3 total flux metre, nthe instrument us
23、ed to measure the level of radiant heat energy incident on the specimen plane at anypoint.4. Summary of Test Method4.1 A horizontally mounted insulation specimen is exposed to the heat from an air-gas radiant heat energy panel located aboveand inclined at 30 6 5 to the specimen. After a short prehea
24、t, the hottest end of the specimen is ignited with a small calibratedflame. The distance to the farthest advance of flaming is measured, converted to kilowatts per square meter from a previouslyprepared radiant flux profile graph, and reported as the critical radiant flux.5. Significance and Use5.1
25、This fire-test-response standard is designed to provide a basis for estimating one aspect of the fire exposure behavior toexposed insulation installed on the floors of building attics. The test environment is intended to simulate conditions that have beenobserved and defined in full-scale attic expe
26、riments.5.2 The test is intended to be suitable for regulatory statutes, specification acceptance, design purposes, or development andresearch.5.3 The fundamental assumption inherent in the test is that critical radiant flux is one measure of the surface burningcharacteristics of exposed insulation
27、on floors or between joists of attics.5.4 The test is applicable to attic floor insulation specimens that follow or simulate accepted installation practice.5.5 In this procedure, the specimens are subjected to one or more specific sets of laboratory fire test exposure conditions. Ifdifferent test co
28、nditions are substituted or the anticipated end-use conditions are changed, caution should be used to predict changesin the performance characteristics measured by or from this test. Therefore, the results are strictly valid only for the fire testexposure conditions described in this procedure.5.5.1
29、 If the test results obtained by this test method are to be considered in the total assessment of fire hazard in a buildingstructure, then all pertinent established criteria for fire hazard assessment developed by Committee E-5 must be included in theconsideration.6. Apparatus6.1 The apparatus shall
30、 be as shown in Fig. 1, located in a draft-protected laboratory that maintains a temperature from 10.0to 26.7C (50 to 80F) and a relative humidity from 30 to 70 %:3 Available from Standardization Documents Order Desk, DODSSP, Bldg. 4, Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http:/w
31、ww.dodssp.daps.mil.E970 1726.1.1 The radiant panel test chamber (Fig. 1 and Fig. 2) shall consist of an enclosure 1400 mm (55 in.) long by 500 mm (1912in.) deep by 710 mm (28 in.) above the test specimen. The sides, ends, and top shall be of 13-mm (12-in.) calcium silicate,740-kg/m3 (46-lb/ft3) nomi
32、nal density, insulating material with a thermal conductivity at 177C (350F) of 0.128 W/(mK) (0.89Btu in./(hft2F). One side shall be provided with an approximately 100 by 1100 mm (4 by 44 in.) draft-tight fire-resistant glasswindow so that the entire length of the test specimen is visible from outsid
33、e the fire test chamber. On the same side and belowthe observation window is a door which, when open, allows the specimen platform to be moved out for mounting or removal oftest specimens. At the low flux end of the chamber on the 500 mm side, a draft-tight fire-resistant window is permitted foraddi
34、tional observations.NOTE 1All dimensions in millimetres. 1 in. = 25.4 mm.FIG. 1 Flooring Radiant Tester Schematic, Side ElevationNOTE 1All dimensions in millimetres. 1 in. = 25.4 mm.FIG. 2 Flooring Radiant Panel Tester Schematic Low Flux End, ElevationE970 1736.1.2 The bottom of the test chamber sha
35、ll consist of a sliding steel platform which has provisions for rigidly securing the testspecimen holder in fixed and level position. The free, or air access, area around the platform shall be in the range from 0.2580 to0.3225 m2 (400 to 500 in.2).6.1.3 When the flame front advance is to be measured
36、, a metal scale marked with 10 mm intervals shall be installed on the backof the platform or on the back wall of the chamber.6.1.4 The top of the chamber shall have an exhaust stack with interior dimensions of 102 6 3 mm (4 6 0.13 in.) wide by 38063 mm (15.0060.13 in.) deep by 31863 mm (12.5060.13 i
37、n.) high at the opposite end of the chamber from the radiant energysource.6.2 Radiant Heat Energy Source, a panel of porous material mounted in a cast iron or steel frame, with a radiation surface of305 by 457 mm (12 by 18 in.). It shall be capable of operating at temperatures up to 816C (1500F). Th
38、e panel fuel system shallconsist of a venturi-type aspirator for mixing gas4 and air at approximately atmospheric pressure, a clean dry air supply capableof providing 28.3 m3/h (1000 f3t/h) at standard temperature and pressure at 76 mm (3.0 in.) of water, and suitable instrumentationfor monitoring a
39、nd controlling the flow of fuel to the panel.6.2.1 The radiant heat energy panel is mounted in the chamber at 30 6 5 to the horizontal specimen plane. The radiant energypanel angle shall be adjusted to obtain the flux profile within the limits specified in accordance with 10.6. The horizontal distan
40、cefrom the 0 mark on the specimen fixture to the bottom edge (projected) of the radiating surface of the panel is 89 6 3 mm (3.56 0.13 in.). The panel-to-specimen vertical distance is 140 6 3 mm (5.5 6 0.13 in.) (Fig. 1).6.2.2 Radiation Pyrometer for standardizing the thermal output of the panel, su
41、itable for viewing a circular area 254 mm (10in.) in diameter at a range of about 1.37 m (54 in.). It shall be calibrated over the 460 to 510C (860 to 950F) operating blackbodytemperature range in accordance with the procedure described in Annex A1.6.2.3 Voltmeter, high-impedance or potentiometric,
42、with a suitable millivolt range shall be used to monitor the output of theradiation pyrometer described in 6.2.2.6.3 Dummy Specimen Holder (Fig. 3 and Fig. 4), constructed from heat-resistant stainless steel (UNS N08330 (AISI Type 330)or equivalent) having a thickness of 1.98 mm (0.078 in.) and an o
43、verall dimension of 1140 by 320 mm (45 by 1234 in.) with aspecimen opening of 200 by 1000 mm (7.9 by 39.4 in.). Six slots shall be cut in the flange on either side of the holder to reducewarping. The holder shall be fastened to the platform with two stud bolts at each end.6.4 Dummy Specimen, used in
44、 the flux profile determination, made of 19-mm (34-in.) inorganic 740-kg/m3 (46-lb/ft 3) nominaldensity calcium silicate board (Fig. 3 and Fig. 4). It is 250 mm (10 in.) wide by 1070 mm (42 in.) long with 27-mm (1116-in.)diameter holes centered on and along the centerline at the 100, 200, 300, . . .
45、 , 900, and 980-mm locations measured from themaximum flux end of the specimen.4 Gas used in this test method shall be either commercial grade propane having a heating value of approximately 83.1 MJ/m3 (2500 Btu/ft 3), or natural gas, or commercialgrade methane having a minimum purity of 96 %.NOTE 1
46、All dimensions in millimetres. 1 in. = 25.4 mm.FIG. 3 Zero Reference Point Related to Detecting PlaneE970 1746.4.1 To provide proper and consistent seating of the flux meter in the hole openings, a stainless steel or galvanized steel bearingplate (Fig. 3 and Fig. 4) shall be mounted and firmly secur
47、ed to the underside of the calcium silicate board with holes correspondingto those specified above. The bearing plate shall run the length of the dummy specimen board and have a width of 76 mm (3.0in.). The thickness of the bearing plate shall be set in order to maintain the flux meter height specif
48、ied in 10.5. The maximumthickness of the bearing plate shall not exceed 3 mm (18 in.).6.5 Total Heat Flux Transducer, to determine the flux profile of the chamber in conjunction with the dummy specimen (Fig. 3),shall be of the Schmidt-Boelter5 type, have a range from 0 to 15 kW/m1.5 W/cm2 (0 to 1.32
49、 Btu/ft2s) and shall be calibrated overthe operating flux level range from 0.100.01 to 15 kW/m1.5 W/cm2 in accordance with the procedure outlined in Annex A1. Asource of 15 to 25C cooling water shall be provided for this instrument.6.5.1 Voltmeter, high-impedance or potentiometric, with a range from 0 to 10 mV and reading to 0.01 mV shall be used tomeasure the output of the total heat flux transducer during the flux profile determination.6.6 Specimen Tray (Fig. 5), constructed from 14-gage heat-resistant stainless steel (UNS-N08330 (AISI Type
