1、Designation:D 2481 81(Reapproved 2002)Standard 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 ado
2、ption 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.Scope
3、1.1 This test method determines the relative effectiveness ofwood preservatives in small wood specimens exposed to anatural marine environment.It is not within the scope of thisprocedure to determine the retention or duration of protectionfor commercial size piles and timbers.1.2 The requirements fo
4、r 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
5、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 Stand
6、ards:D 390 Specification for Coal-Tar Creosote for the Preserva-tive Treatment of Piles,Poles,and Timbers for Marine,Land,and Fresh Water Use2D 1165 Nomenclature of Domestic Hardwoods and Soft-woods2D 2665 Specification for Poly(Vinyl Chloride)(PVC)Plas-tic Drain,Waste,and Vent Pipe and Fittings33.S
7、ummary 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 deter
8、mined 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 theto
9、lerance 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 efficacybetwee
10、n 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 bef
11、ore 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.If necessary(for example,for convenience in han-dling)blocks ma
12、y be drilled through the center of a tangentialface with a 3-mm drill.The volume of the blocks without the1This 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 Oct.30,19
13、81.Published December 1981.Originallypublished as D 2481 66.Last previous edition D 2481 70(1977).2Annual Book of ASTM Standards,Vol 04.10.3Annual Book of ASTM Standards,Vol 08.04.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.hole shoul
14、d be approximately 6.9 mL and the blocks with thehole 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%
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
16、 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 weight of the test specimen before impregnation,T2=weight of the test specimen immediately after impregnati
