ASTM_D_2898_-_10.pdf

Designation:D289810Standard Practice forAccelerated Weathering of Fire-Retardant-Treated Wood forFire Testing1This standard is issued under the fixed designation D2898;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 practice addresses the durability of a fire-retardanttreatment of wood products by exposure to accelerated cyclesof wetting,drying,or ultraviolet(UV)exposure,or combina-tion thereof,prior to evaluation by a fire response test.Fourconditioning methods are described.1.2 This practice is applicable to wood products that havebeen treated with fire-retardant chemicals by pressure impreg-nation.1.3 The test specimens are to be in the form of,or suitablefor fabrication into,test specimens,such as those described inTest Methods E84,E108,and E1354 and other standard testmethods for evaluating the fire performance of fire-retardant-treated wood products.1.4 The text of these methods references notes and footnotesthat provide explanatory material.These notes and footnotes(excluding those in tables and figures)shall not be consideredas requirements of these test methods.1.5 The values 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 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.2.Referenced Documents2.1 ASTM Standards:2D9 Terminology Relating to Wood and Wood-Based Prod-uctsE84 Test Method for Surface Burning Characteristics ofBuilding MaterialsE108 Test Methods for Fire Tests of Roof CoveringsE176 Terminology of Fire StandardsE1354 Test Method for Heat and Visible Smoke ReleaseRates for Materials and Products Using an Oxygen Con-sumption Calorimeter2.2 ICC Evaluation Service Acceptance Criteria:3AC 107 Classified Wood Roof Systems2.3 UL Standards:4UL 790 Tests for Fire Resistance of Roof Covering Material3.Terminology3.1 DefinitionsDefinition used in this practice are inaccordance with Terminologies D9 and E176,unless otherwiseindicated.4.Significance and Use4.1 This practice describes different methods of exposingfire-retardant-treated wood products or assemblies to con-trolled accelerated weathering or conditioning.4.2 The conditioning simulates effects of leaching,drying,temperature,and,in two methods,UV light.4.3 Method A is the method normally specified for regula-tory purposes when testing fire-retardant-treated wood that isintended for exterior applications.5.Apparatus5.1 The test apparatus shall be capable of subjecting thespecimen uniformly to the test conditions described in Section7.5.2 No special means of protecting the specimen back andedges are required,but water shall not impinge directly onthose surfaces which are not exposed either to the weather inthe assembled form,or to fire in the subsequent test.Waterspray nozzles shall be provided and arranged so as to distributewater evenly over the exposed specimen surface.1This practice is under the jurisdiction of ASTM Committee D07 on Wood andare the direct responsibility of Subcommittee D07.07 on Fire Performance of Wood.Current edition approved March 1,2010.Published March 2010.Originallyapproved in 1970.Last previous edition approved in 2009 as D2898 09.DOI:10.1520/D2898-10.2For 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.3Available from ICC Evaluation Service,Inc.,5360 Workman Mill Road,Whittier,CA 90601,http:/icc-es.org.4Available from Underwriters Laboratories,Inc.,333 Pfingsten Road,North-brook,IL 60062,http:/.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.3 Accompany drying cycles with heating that is thermo-statically controlled.The controlling temperature shall be theair temperature measured 1 in.(25 mm)above the specimensurface.When sunlamps are part of the method,thetemperature-measuring device must be shielded from the UVradiation of the sunlamps.Accompany drying with uniformforced air movement across the surface of the decks at a rate ofat least 25 ft/min(0.127 m/s).Forced air movement shall beuniform across the specimen surface,with provisions made foradequate air changes to assure thorough drying.5.4 In Methods B and C,UV light shall be distributed asevenly as possible over the specimen surface.Use sunlamps5providing UV characteristics of 5.0 W/m2irr