1、Designation: E2768 11An American National StandardStandard Test Method forExtended Duration Surface Burning Characteristics ofBuilding Materials (30 min Tunnel Test)1This standard is issued under the fixed designation E2768; the number immediately following the designation indicates the year oforigi
2、nal 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 The purpose of this fire-test-response standard is toevaluate th
3、e ability of a product to limit the surface spread offlame when evaluated for 30 min. This fire-test-responsestandard uses the apparatus and procedure of Test Method E84with the total test period extended to 30 min.1.2 Building applications affecting fire and life safety oftenrequire products with s
4、pecific criteria for surface spread offlame and flame spread index. The resulting performancecharacteristics included in the conditions of classification forthis fire-test-response standard are intended to be used forregulatory purposes to determine the suitability of materials orproducts for use in
5、 buildings under specified conditions wheresignificantly reduced surface burning characteristics are re-quired.1.3 Materials and products that are beyond the scope of TestMethod E84 are beyond the scope of this standard.1.4 Materials or products which melt, drip or delaminate tothe extent that the c
6、ontinuity of the flame front is destroyed arebeyond the scope of this standard.NOTE 1Testing of materials that melt, drip, or delaminate to such adegree that the continuity of the flame-front is destroyed, results in lowflame spread indices that do not relate directly to indices obtained bytesting m
7、aterials that remain in place. Materials or products that melt, drip,or delaminate, or that cannot support their own weight, have the potentialfor demonstrating reduced flame spread results as compared to the flamespread results where the materials or products remain in place duringtesting.1.5 The v
8、alues stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.6 The text of this standard references notes and footnotesthat provide explanatory informati
9、on. These notes and foot-notes, excluding tables and figures, shall not be considered asrequirements of the standard.1.7 This standard is used to measure and describe theresponse of materials, products, or assemblies to heat andflame under controlled conditions, but does not by itselfincorporate all
10、 factors required for fire hazard or fire riskassessment of the materials, products, or assemblies underactual fire conditions1.8 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 ap
11、pro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.1.9 Fire testing is inherently hazardous. Adequate safe-guards for personnel and property shall be employed inconducting these tests.2. Referenced Documents2.1 ASTM Standards:2E84 Test Meth
12、od for Surface Burning Characteristics ofBuilding MaterialsE176 Terminology of Fire Standards2.2 ICC Codes3IBC International Building CodeIWUIC International Wildland Urban Interface CodeIRC International Residential Code2.3 NFPA Code4NFPA 101 Life Safety Code2.4 California Building Code5CBC Califor
13、nia Building Code3. Terminology3.1 DefinitionsFor definitions of terms used in this testmethod, refer to Terminology E176 and Test Method E84. The1This test method is under the jurisdiction of ASTM Committee E05 on FireStandards and is the direct responsibility of Subcommittee E05.22 on SurfaceBurni
14、ng.Current edition approved July 1, 2011. Published August 2011. DOI: 10.1520/E2768-11.2For 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 Summar
15、y page onthe ASTM website.3ICC codes are available from International Code Council, 4051 W. FlossmoorRd., Country Club Hills, IL 60478.4NFPA Codes are available from National Fire Protection Association, 1Batterymarch Park, Quincy, MA, 02269.5CBC codes are available from http:/ ASTM International, 1
16、00 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.terms surface flame spread, flame spread index, and smokedeveloped index are of particular interest to this standard.4. Summary of Test Method4.1 This test method is conducted using the same equip-ment, apparatus, cal
17、ibration, and calculation of flame spreadindex and smoke developed index as Test Method E84.4.2 Test Method E84 exposes a nominal 24-ft long by 20-inwide (7.32 m by 508 mm) specimen to a controlled air flow andflaming fire exposure adjusted to spread the flame along theentire length of the select gr
18、ade red oak specimen in 5.5 min(615 s). Test Method E84 measures the flame spread distancefrom a point beginning 4.5 ft (1.4 m) beyond the centerline ofthe burners.4.3 The flame spread index is determined during the initial10 min of the test period and calculated as described in TestMethod E84.4.4 I
19、n this test method, the Test Method E84 test is extendedby 20 min to a 30 min test period. Determination is made of thedistance traveled by the flame front (surface spread of flame) asmeasured from the centerline of the burners during the 30 mintest period.4.5 The test method has conditions for clas
20、sification inSection 13.5. Significance and Use5.1 This standard is useful to establish the relative surfaceburning characteristics of materials or products under labora-tory conditions for a 30 min test period.5.2 The performance characteristics in the conditions ofclassification are intended to be
21、 used in specific applications asrequired by building codes or other regulatory requirements orspecifications.5.3 This test method does not provide the measurement ofheat transmission through the tested surface.5.4 This test method does not provide the classification ordefinition of a material or pr
22、oduct as noncombustible, bymeans of the results from this standard test or flame spreadindex by itself.6. Apparatus/Test Equipment6.1 The apparatus, equipment, recording devices, and sys-tems are to be the same as those detailed in Test Method E84.7. Hazards7.1 This test is conducted using the equip
23、ment, apparatus,and procedure of Test Method E84. The hazards described inTest Method E84 are applicable.8. Sampling, Test Specimens and Test Units8.1 The test specimens shall be representative of the mate-rial or product being evaluated.8.2 Materials or products that are not homogeneous or arenot s
24、ymmetrical about their longitudinal axis shall have eachsurface evaluated separately.8.2.1 Surfaces of the material or product that, due to theirsmall surface area, are impractical to test in accordance withTest Method E84 (for example, the edges of a piece ofplywood) are excluded from this requirem
25、ent.8.2.2 It shall be permissible to test and classify one or moresurfaces of a material or product as meeting the conditions ofclassification of this standard and classify without testing theother surfaces as not meeting the conditions of classification ofthis standard.8.3 Test Specimens:8.3.1 The
26、test specimen sizes shall comply with thosedescribed in Test Method E84.8.3.2 Applicable practices listed in Test Method E84 andrelated provisions of Test Method E84 shall be used forspecimen preparation and mounting.9. Calibration and Standardization9.1 The calibration and standardization of the ap
27、paratus andequipment for this standard shall be as described in TestMethod E84.10. Conditioning10.1 Conditioning of test specimens shall be conducted asdescribed in Test Method E84.11. Procedure11.1 Conduct the test in accordance with Test Method E84with the following additional requirements:11.1.1
28、The test shall be continued for a total period of 30min.11.2 During the initial 10 min of the test, record the timesand extent of flame front advancement in accordance with TestMethod E84. Observe and record the maximum flame fronttravel from the centerline of the burners during the 30-minperiod of
29、the test. This method uses the recording devices ofTest Method E84 (see Note 2).NOTE 2If for purpose of calculating the flame spread index the zeropoint of the recording equipment is at the base end of the ignition fire, themaximum flame front travel distance required in this standard shall be there
30、corded distance plus 4.5 ft. (1.4 m) In Test Method E84 and thisstandard, the calculation of the flame spread index is based on the flamespread distance measured from a point beginning 4.5 ft (1.4 m) beyond thecenterline of the burners during the first 10 min.11.3 Follow all other procedures describ
31、ed in Test MethodE84 including those for determination of flame spread indexduring the initial 10 min.11.4 The determination of the smoke developed indexduring the initial 10 min of this test is optional.12. Interpretation of Results12.1 Determine the following:12.1.1 Flame spread index and smoke de
32、veloped index(optional) during the initial 10 min in accordance with TestMethod E84 (see Note 2).12.1.2 The maximum distance of surface spread of flame asmeasured from the centerline of the burner during the 30 mintest period.12.2 Where separate tests are conducted on different sur-faces of the test
33、 specimens (See 8.2) the information specifiedin 12.1.1 and 12.1.2 shall be determined for each testedsurface.E2768 11213. Conditions of Classification13.1 The test method has the following conditions ofclassification for a material or product to be classified asmeeting the requirements of this stan
34、dard:13.1.1 The flame spread index shall be 25 or less asdetermined for the initial 10 min test period,13.1.2 The flame front shall not progress more than 10.5 ft(3.2 m) beyond the centerline of the burners at any time duringthe 30 min test period. This is considered evidence of nosignificant progre
35、ssive combustion in this test method.13.2 For materials or products that are not homogeneous orsymmetrical about their longitudinal axis, only surfaces thathave been individually tested shall be eligible to be classifiedand reported as meeting the conditions of classification of thisstandard.14. Rep
36、ort14.1 The report shall clearly state that it applies to allsurfaces of the material or product tested in accordance withthe standard or, where the material or product is not homoge-neous or symmetrical about its longitudinal axis, the reportshall state that it only applies to those surfaces that h
37、ave beentested and so classified in accordance with this standard.14.2 The following shall be included in the test report:14.2.1 Report the material (or product) or separate surfacesof the material (or product) as meeting the conditions ofclassification if the test results for the test specimens mee
38、t theconditions of classification of 13.1. Test results shall bereported for each surface tested.14.2.2 Where a material or product is not homogeneous orsymmetrical about its longitudinal axis and all surfaces havenot been individually tested, those surfaces not tested shall beclearly identified and
39、 reported as unclassified in accordancewith this standard.14.2.3 Description of the material or product to include itsthickness and the nominal width of the material or product usedto construct the test specimens.14.2.4 Non-proprietary information on the process, treat-ment, or surface condition whi
40、ch forms the basis of identifyingthe material or product. For a manufactured or treated product,the date of manufacture or treatment.14.2.5 Date of test specimen construction and the construc-tion details including the number of sections, methods ofjoining, and any deviations from construction detai
41、ls specifiedin any applicable Practice on the mounting of the test speci-men.14.2.6 Conditioning of test specimens prior to evaluation.14.2.7 Description of the mounting method.14.2.7.1 If there is an applicable Practice (see Test MethodE84) for the mounting of the test specimen, state the Practiced
42、esignation and any deviations from the applicable Practice.14.2.8 The maximum measurement of surface spread offlame and time of occurrence for each test.14.2.9 The flame spread index for each test.14.2.10 If recorded, the smoke developed index for eachtest.14.2.11 Observation of the specimen during
43、the total testperiod for factors which influence the interpretation of resultsincluding, but not limited to, delamination, sagging, shrinkage,fallout, disruption of the continuity of the flame front orsmoldering.14.2.12 Graphical plots of the flame spread versus time forthe test duration and if reco
44、rded, the smoke developed versustime for the initial 10 min of the test period. The distance axisof the flame spread graph shall be labeled to indicate the origin(either the burner centerline or +4.5 ft (1.4 m).15. Precision and Bias15.1 The precision and bias of this test method for measur-ing flam
45、e spread and smoke developed index are as specified inTest Method E84.15.2 No information is presented about either the precisionor the bias for observing the occurrence of flame frontprogressing beyond 10.5 ft (3.2 m) since the test result isdeterminate.16. Keywords16.1 flame spread index; surface
46、burning characteristics;smoke develop indexAPPENDIX(Nonmandatory Information)X1. COMMENTARYX1.1 IntroductionX1.1.1 This commentary has been prepared to provide theuser of this test method with background information on thestandard.X1.1.2 This standard is based on a modification of TestMethod E84 tha
47、t has been used for many years in provisions inthe building codes and related specifications pertaining tofire-retardant-treated wood. Such codes include the Interna-tional Building Code (IBC) and International Residential Code(IRC) as well as other documents. The test requirement is onlyone of the
48、performance requirements for fire-retardant-treatedwood in the building codes. There are other performancerequirements and inherent characteristics of fire-retardant-treated wood that were considered relevant when provisions inthe codes were approved to allow the use of fire-retardant-treated wood i
49、n specific applications.E2768 113X1.1.3 It was commonly referred to as the “30-minutes E84tunnel test.” However, Test Method E84 has no provisions forextending the test to the 30 min duration.X1.1.4 The “Extended Test Method E84 test” is increas-ingly being used in requirements that are not limited tofire-retardant-treated wood. For example, the InternationalWildland Urban Interface Code (IWUIC) and California Build-ing Code (CBC) use the test for assessing materials andproducts that can be designated as ignition-
