ASTM E662-2017a red 1250 Standard Test Method for Specific Optical Density of Smoke Generated by Solid Materials《由固体材料产生的烟雾特定光密度的标准试验方法》.pdf
《ASTM E662-2017a red 1250 Standard Test Method for Specific Optical Density of Smoke Generated by Solid Materials《由固体材料产生的烟雾特定光密度的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM E662-2017a red 1250 Standard Test Method for Specific Optical Density of Smoke Generated by Solid Materials《由固体材料产生的烟雾特定光密度的标准试验方法》.pdf(30页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: E662 17E662 17a An American National StandardStandard Test Method forSpecific Optical Density of Smoke Generated by SolidMaterials1This standard is issued under the fixed designation E662; the number immediately following the designation indicates the year oforiginal adoption or, in the
2、 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.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope*1.1
3、This fire-test-response standard covers determination of the specific optical density of smoke generated by solid materialsand assemblies mounted in the vertical position in thicknesses up to and including 1 in. (25.4 mm).1.2 Measurement is made of the attenuation of a light beam by smoke (suspended
4、 solid or liquid particles) accumulating withina closed chamber due to nonflaming pyrolytic decomposition and flaming combustion.1.3 Results are expressed in terms of specific optical density which is derived from a geometrical factor and the measuredoptical density, a measurement characteristic of
5、the concentration of smoke.1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information only and are not considered standard.1.5 This standard measures and describes the response of
6、 materials, products, or assemblies to heat and flame under controlledconditions, but does not by itself incorporate all factors required for fire hazard or fire risk assessment of the materials, productsor assemblies under actual fire conditions.1.6 This standard does not purport to address all of
7、the safety concerns, if 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 This international standard was developed in accordance with inter
8、nationally recognized principles on standardizationestablished in the Decision on Principles for the Development of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2C1186 S
9、pecification for Flat Fiber-Cement SheetsC1288 Specification for Discrete Non-Asbestos Fiber-Cement Interior Substrate SheetsD2843 Test Method for Density of Smoke from the Burning or Decomposition of PlasticsE176 Terminology of Fire StandardsE662 Test Method for Specific Optical Density of Smoke Ge
10、nerated by Solid Materials3. Terminology3.1 DefinitionsFor definitions of terms found in this test method refer to Terminology E176.4. Summary of Test Method4.1 This test method employs an electrically heated radiant-energy source mounted within an insulated ceramic tube andpositioned so as to produ
11、ce an irradiance level of 2.2 Btu/sft2 (2.5 W/cm2) averaged over the central 1.5-in. (38.1-mm) diameterarea of a vertically mounted specimen facing the radiant heater. The nominal 3 by 3-in. (76.2 by 76.2-mm) specimen is mounted1 This test method is under the jurisdiction ofASTM Committee E05 on Fir
12、e Standards and is the direct responsibility of Subcommittee E05.21 on Smoke and CombustionProducts.Current edition approved Feb. 1, 2017July 1, 2017. Published March 2017July 2017. Originally approved in 1979. Last previous edition approved in 20152017 asE662 15a.E662 17. DOI: 10.1520/E0662-17.10.1
13、520/E0662-17A.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is in
14、tended only to provide the user of an ASTM standard an indication of what 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 cur
15、rent versionof the standard as published by ASTM is to be considered the 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 States1within a holder which exposes
16、an area measuring 2916 by 2916 in. (65.1 by 65.1 mm).The holder is able to accommodate specimensup to 1 in. (25.4 mm) thick. This exposure provides the nonflaming condition of the test.4.2 For the flaming condition, a six-tube burner is used to apply a row of equidistant flamelets across the lower e
17、dge of theexposed specimen area and into the specimen holder trough. This application of flame in addition to the specified irradiance levelfrom the heating element constitutes the flaming combustion exposure.4.3 The test specimens are exposed to the flaming and nonflaming conditions within a closed
18、 chamber. A photometric systemwith a vertical light path is used to measure the varying light transmission as smoke accumulates. The light transmittancemeasurements are used to calculate specific optical density of the smoke generated during the time period to reach the maximumvalue.35. Significance
19、 and Use5.1 This test method provides a means for determining the specific optical density of the smoke generated by specimens ofmaterials and assemblies under the specified exposure conditions. Values determined by this test are specific to the specimen orassembly in the form and thickness tested a
20、nd are not to be considered inherent fundamental properties of the material tested. Thus,it is likely that closely repeatable or reproducible experimental results are not to be expected from tests of a given material whenspecimen thickness, density, or other variables are involved.5.2 The photometri
21、c scale used to measure smoke by this test method is similar to the optical density scale for human vision.However, physiological aspects associated with vision are not measured by this test method. Correlation with measurements byother test methods has not been established.45.3 At the present time
22、no basis is provided for predicting the density of smoke generated by the materials upon exposure toheat and flame under other fire conditions.5.4 The test method is of a complex nature and the data obtained are sensitive to variations which in other test methods mightbe considered to be insignifica
23、nt (see Section 6). A precision statement based on the results of a roundrobin test by a prior draftversion of this test method is given in 14.15.5 In this procedure, the specimens are subjected to one or more specific sets of laboratory test conditions. If different testconditions are substituted o
24、r the end-use conditions are changed, it is not always possible by or from this test method to predictchanges in the fire-test-response characteristics measured. Therefore, the results are valid only for the fire test exposure conditionsdescribed in this procedure.6. Limitations6.1 If during the tes
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