1、Designation:D 368 89(Reapproved 2002)American Association StateHighway Transportation Officials StandardAASHTO No.T 86Standard Test Method forSpecific Gravity of Creosote and Oil-Type Preservatives1This standard is issued under the fixed designation D 368;the number immediately following the designa
2、tion 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.1.Scope1.1 This test method covers the determinati
3、on of the specificgravity of oil-type preservatives by means of the hydrometer.Test Methods D 38 covers the sampling of wood preservativesprior to testing.To determine the specific gravity of distillationfractions of such preservatives use Test Method D 369.1.2 This standard does not purport to addr
4、ess 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:D 38 Test Methods f
5、or Sampling Wood Preservatives Priorto Testing2D 347 Test Method for Volume and Specific Gravity Cor-rection Tables for Creosote and Coal Tar2D 369 Test Method for Specific Gravity of Creosote Frac-tions and Residue2D 390 Specification for Coal-Tar Creosote for the Preserva-tive Treatment of Piles,P
6、oles,and Timbers for Marine,Land,and Fresh Water Use2D 391 Specification for Creosote-Coal Tar Solution2E 1 Specification for ASTM Thermometers3E 100 Specification for ASTM Hydrometers33.Summary of Test Method3.1 A hydrometer is floated in a totally liquid sample of thepreservative solution.The spec
7、ific gravity is read at themeniscus of the stem and corrected to the desired temperature.4.Significance and Use4.1 This is a test method to determine the specific gravity ofcreosote and creosote-coal tar solutions for conformance toSpecifications D 390 and D 391.It may also be used with otheroil-typ
8、e preservatives.5.Apparatus5.1 HydrometersA set of three hydrometers covering therange 1.000 to 1.150 and conforming to the requirements forhydrometers 125H(range 1.000 to 1.050),126H(range 1.050to 1.100),and 127H(range 1.100 to 1.150)is prescribed inSpecification E 100.If not available,hydrometers(
9、60/60F)inthe range 1.000 to 1.150 of similar accuracy and having a scalelength not less than 9.5 mm/0.010 units of specific gravity,maybe used.5.2 Hydrometer CylinderA glass cylinder having thefollowing approximate dimensions:Lengthapproximately 300 mmDiameternot less than 32 mm5.3 ThermometerAn AST
10、M Low Softening Point Ther-mometer having a range from 2 to 80C(30 to 180F),conforming to the requirements for Thermometer 15C(15F)asdescribed in Specification E 1,or other thermometer of suitablerange and precision.6.Procedure6.1 Place the oil in the cylinder to a depth sufficient to floatthe hydro
11、meter,and with thorough stirring to ensure unifor-mity,adjust the temperature to 38C(100F),or if not entirelyliquid at that temperature,to the lowest temperature at whichthe oil is completely liquid(Note 1).Insert the hydrometer andallow the instrument to settle until it is in floating equilibrium.T
12、hen read the height of the meniscus on the stem of thehydrometer and the temperature to the nearest 0.1C(0.2F).Add to the hydrometer reading an increment of specific gravityequivalent to 1 mm on the scale.Then correct this observedspecific gravity at the observed temperature to the specificgravity a
13、t 38/15.5C using Table 2 of Test Method D 347.NOTE1It is advantageous to have the cylinder immersed in a bathmaintained at the temperature of test.NOTE2See Table 1.1This test method is under the jurisdiction of ASTM Committee D-7 on Woodand is the direct responsibility of Subcommittee D07.06 on Trea
14、tments for WoodProducts.Current edition approved Oct.29,1989.Published December 1989.Originallypublished as D 368 33 T.Last previous edition D 368 84.This test method is identical in substance with the Standard Method for theDetermination of the Specific Gravity of Oil-Type Preservatives which is pa
15、rt of theAmerican Wood-PreserversAssociation Standard Methods forAnalysis of Creosoteand Oil-Type Preservatives(A1 62).Acknowledgment is made to the AmericanWood-Preservers Association for its development of the subject matter covered inthis test method.2Annual Book of ASTM Standards,Vol 04.10.3Annu
16、al Book of ASTM Standards,Vol 14.03.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.7.Report7.1 Report the specific gravity at 38/15.5C to the nearestone thousandth unit of specific gravity.8.Precision and Bias8.1 The following criteria should be used for judging theacceptability of results at the 95%probability level:8.1.1 RepeatabilityDuplicate determinations by the sameoperator should not be considered suspect unless the reportedre
