ASTM_D_4986_-_10.pdf

Designation:D498610Standard Test Method forHorizontal Burning Characteristics of Cellular PolymericMaterials1This standard is issued under the fixed designation D4986;the number immediately following the designation indicates the year oforiginal 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*1.1 This fire-test-response test method describes a small-scale horizontally oriented burning test procedure for compar-ing the relative rate of burning and the extent and time ofburning of cellular polymeric materials having a density lessthan 250 kg/m3.1.2 The classification system described in the Appendix X1is intended for quality assurance and the preselection ofcomponent materials for products.1.3 This standard measures and describes the response ofmaterials,products,or assemblies to heat and flame undercontrolled conditions,but does not by itself incorporate allfactors required for fire hazard or fire risk assessment of thematerials,products,or assemblies under actual fire conditions.1.4 The values stated in SI units are to be regarded asstandard.1.5 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 of regulatory limitations prior to use.For a specifichazard statement,see Note 3.1.6 Fire testing is inherently hazardous.Adequate safe-guards for personnel and property shall be employed inconducting these tests.NOTE1This test method is equivalent to ISO 9772.2.Referenced Documents2.1 ASTM Standards:2D4483 Practice for Evaluating Precision for Test MethodStandards in the Rubber and Carbon Black ManufacturingIndustriesD5025 Specification for Laboratory Burner Used for Small-Scale Burning Tests on Plastic MaterialsE176 Terminology of Fire StandardsE437 Specification for Industrial Wire Cloth and Screens(Square Opening Series)(Discontinued 2000)Replacedby E 2016(Withdrawn 2000)32.2 ISO Standard:ISO 9772 Cellular PlasticsDetermination of HorizontalBurning Characteristics of Small Specimens Subjected toa Small Flame43.Terminology3.1 Definitions:3.1.1 For definitions of fire-related terms used in this testmethod,refer to Terminology E176.3.1.2 afterflame time,nthe length of time for which amaterial continues to flame,under specified conditions,afterthe ignition source has been removed.3.1.3 afterglow time,nthe length of time for which amaterial continues to glow under specified test conditions,afterthe ignition source has been removed or cessation of flaming,or both.3.1.4 flame,vto undergo combustion in the gaseous phasewith emission of light.3.1.5 glow,nvisible light,other than from flaming,emit-ted by a solid undergoing combustion.4.Summary of Test Method4.1 This test method for measuring the burning characteris-tics of cellular polymeric materials employs a small standardtest specimen 50 by 150 mm.The specimen is supportedhorizontally.One end is exposed to a specified gas flame for 60s and the extent of burning is measured.5.Significance and Use5.1 This test method provides a means of measuring thetime and extent of burning for cellular polymeric materials.It1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.30 on Thermal Properties.Current edition approved Jan.1,2010.Published February 2010.Originallyapproved in 1989.Last previous edition approved in 2003 as D4986 03.DOI:10.1520/D4986-10.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.*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 States1 also provides a means of measuring burning rates for materialsthat continue to burn past the specified gage marks.5.2 This test method provides a means of comparing theburning characteristics of materials of like thickness density,cell size,and skin irregularities,including the effect of fallingparticles of cellular polymeric materials.It is suitable forquality control,specification acceptance,and for research anddevelopment.Examples include filled or reinforced,rigid orflexible,or cut or formed materials5.3 In this test method,the specimens are subjected to oneor more specific sets of laboratory fire test exposure conditions.If different test conditions are substituted or if the anticipatedend-use