ASTM_D_2481_-_05.pdf

Designation:D 2481 05Standard Test Method forAccelerated Evaluation of Wood Preservatives for MarineServices by Means of Small Size Specimens1This standard is issued under the fixed designation D 2481;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(e)indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1.Scope1.1 This test method covers the relative effectiveness ofwood preservatives in small wood specimens exposed to anatural marine environment.It is not within the scope of thistest method to determine the retention or duration of protectionfor commercial size piles and timbers.1.2 The requirements for preparing the material for testingand the test procedures appear in the following order:SectionSummary of Test Method3Test Specimens5Pretreatment Handling6Treatment Procedure7Post-Treatment Handling8Assembly of Test Specimens9Exposure10Inspection11Evaluation of Results12Reports131.3 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:2D 390 Specification for Coal-Tar Creosote for the Preserva-tive Treatment of Piles,Poles,and Timbers for Marine,Land,and Freshwater UseD 1165 Nomenclature of Domestic Hardwoods and Soft-woodsD 2665 Specification for Poly(Vinyl Chloride)(PVC)Plas-tic Drain,Waste,and Vent Pipe and Fittings3.Summary of Test Method3.1 Small panels or blocks of wood are impregnated with anappropriate series of retentions of a preservative and areprepared for exposure,according to specified procedures.Theyare then exposed by total immersion in a natural marineenvironment.An index of physical condition determined dur-ing periodic inspection is used to measure the effectiveness ofpreservative treatment.4.Significance and Use4.1 This test method is useful in determining the relativeefficacy between various treatments and naturally occurringwood-destroying agents.It is an initial means of estimating thetolerance limits of the biologically destructive agents or thethreshold values of the chemical preservative,or both.4.2 This test method is not intended to provide quantifiablereproducible values.It is a qualitative method designed toprovide a reproducible means of establishing relative efficacybetween experimental contract levels.5.Test Specimens5.1 Selection of WoodUse sapwood of southern or Pon-derosa pine or Douglas-fir for standard comparative tests.Useboards free from knots or excessive resins,and showing novisible evidence of infection by mold,stain,or decay fungi.Drill mounting holes before treatment.5.2 Selection of Size:5.2.1 A Panels6 by 38 by 152 mm,vertical grain withlongitudinal grain direction in the 152-mm dimension.5.2.2 B Panels19 by 76 by 460 mm.5.2.3 C Blocks19 by 19 by 19 mm,milled as accurately aspossible.Holes drilled through the center of a tangential facewith a 3-mm drill shall be permitted for handling.The volume1This test method is under the jurisdiction of ASTM Committee D07 on Woodand is the direct responsibility of Subcommittee D07.06 on Treatments for WoodProducts.Current edition approved August 15,2005.Published August 2005.Originallyapproved in 1966.Last previous edition approved in 2002 as D 2481 81(2002).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.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.of the blocks without the hole is approximately 6.9 mL and theblocks with the hole approximately 6.8 mL.5.2.4 Sample size shall remain constant within a givenseries of tests.6.Pretreatment Handling6.1 Initial Conditioning and Initial WeightsCondition thespecimens for treatment by bringing them to moisture equilib-rium under 15%ovendry basis in a constant-temperatureroom,in an appropriate dry storage room,or by kiln drying.6.2 WeighingSpecimens of uniform density as determinedby their original weight facilitate uniform treatments withingroups.Before impregnation,number and weigh them to thenearest 0.01 g forApanels,and 1.0 g for B panels.This weightis referred to as the initial or untreated weight of the specimen(T1).Segregate specimens selected into treatment groups ofapproximate equal density as determined by weight.NOTE1Coding the different weights as T1,T2,and T3avoidsconfusion and simplifies recording.The suggested system of T(tare)designation is as follows,with all weights recorded in grams:T1=initial