ASTM_D_3806_-_19a.pdf

Designation:D380619aStandard Test Method ofSmall-Scale Evaluation of Fire-Retardant Paints(2-FootTunnel Method)1This standard is issued under the fixed designation D3806;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.Scope1.1 This test method determines the protection a coatingaffords its substrate,and the comparative burning characteris-tics of coatings by evaluating the flame spread over the surfacewhen ignited under controlled conditions in a small tunnel.This establishes a basis for comparing surface-burning charac-teristics of different coatings without specific consideration ofall the end-use parameters that might affect surface-burningcharacteristics under actual fire conditions.1.2 In addition to the experimental flame spread rate,theweight of panel consumed,time of afterflaming and afterglow,char dimensions and index,and height of intumescence can bemeasured in this test.However,a relationship should not bepresumed among these measurements.1.3 This standard is used to determine certain fire-testresponses of materials,products,or assemblies to heat andflame under controlled conditions by using results obtainedfrom fire-test response standards.The results obtained fromusing this standard do not by themselves constitute measures offire hazard or fire risk.1.4 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.5 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 factors required for fire hazard or fire riskassessment of the materials,products,or assemblies underactual fire conditions.1.6Fire testing is inherently hazardous.Adequate safe-guards for personnel and property shall be employed inconducting these tests.1.7 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.8 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D344 Test Method for Relative Hiding Power of Paints bythe Visual Evaluation of Brushouts(Withdrawn 2018)3D1475 Test Method for Density of Liquid Coatings,Inks,and Related ProductsD2196 Test Methods for Rheological Properties of Non-Newtonian Materials by Rotational ViscometerE84 Test Method for Surface Burning Characteristics ofBuilding Materials2.2 Federal Standard:Fed.Spec.TT-V-119 Varnish,Spar,Phenolic Resin43.Significance and Use3.1 A number of laboratory procedures are used to evaluatethe effectiveness of fire-retardant and fire-resistant treatmentsand coatings.In general,these methods measure the threestages of fire development:(1)ignition;(2)flame spread(rateof growth of the fire);and(3)conflagration extent.While allthree are of extreme importance,flame spread has beenrecognized as the main factor associated with testing fire-retardant coatings.3.2 Flame spread ratings based upon Test Method E84 haveacquired common acceptance by regulatory agencies,but such1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.21 on Chemical Analysis of Paints and Paint Materials.Current edition approved Dec.1,2019.Published December 2019.Originallyapproved in 1979.Last previous edition approved in 2019 as D3806 19.DOI:10.1520/D3806-19A.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 DLA Document Services,Building 4/D,700 Robbins Ave.,Philadelphia,PA 19111-5094,http:/quicksearch.dla.mil.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 large-scale tests are