1、Designation:D 246 95e1American Association StateHighway Transportation Officials StandardAASHTO No.T 62Standard Test Method forDistillation of Creosote and Creosote-Coal Tar Solutions1This standard is issued under the fixed designation D 246;the number immediately following the designation indicates
2、 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.e1NOTEAn editorial correction was made in 5.8 in March 1998.1.Sc
3、ope1.1 This test method covers a procedure for the distillationof creosote and creosote-coal tar solution.Test Methods D 38covers the sampling of wood preservatives prior to testing.1.2 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is therespon
4、sibility 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 for Sampling Wood Preservatives Priorto Testing2D 370 Test Method for Dehydra
5、tion of Oil-Type Preserva-tives2D 390 Specification for Coal-Tar Creosote for the Preserva-tive Treatment of Piles,Poles,and Timbers for Marine,Land,and Fresh Water Use2D 391 Specification for Creosote-Coal Tar Solution2E 1 Specification for ASTM Thermometers3E 1404 Specification for Laboratory Glas
6、s Conical Flasks4E 1405 Specification for Laboratory Glass DistillationFlasks43.Summary of Test Method3.1 A 100-g sample is distilled at a controlled rate in a300-mL flask.The weights of distillate fractions at a series ofspecified temperatures and of residue at the maximum specifiedtemperature are
7、determined.The residue and distillates may betested by appropriate procedures.4.Significance and Use4.1 Creosote quality is defined by the boiling ranges of itsdistillation fractions.The boiling limits of the fractions asdetermined by this test method must conform to the limitsestablished by Specifi
8、cations D 390 and D 391 to qualify thecreosote as an acceptable preservative for its intended appli-cation.5.Apparatus5.1 FlaskDistillation flask,300 mL,specified as Type II,Class 2 in Specification E 1405.5.2 Condenser TubeA tapered glass condenser,as shownin Fig.1 and Fig.2,conforming to the follo
9、wing dimensions:Diameter of small end,outside12.5 6 1.5 mmDiameter of large end,outside28.5 6 3.0 mmLength360 6 4mmLength of tapered part100 6 5mm5.3 Source of HeatAsource of heat consisting of a bunsenor Meker type gas burner or an electric heater.The electricheater5shall have an output variable to
10、 600 or to 750 W andremovable upper and lower refractories as illustrated in Fig.3.The temperature of the heater shall be controlled by a variabletransformer or rheostate suitable for the voltage used,and shallbe fitted with a clamp for mounting on a vertical support rod.5.4 Flask Shield for Flame D
11、istillationA stainless steelshield,fitted with mica windows and lined with18-in.heat-resistant ceramic board,with two-part cover made from14-in.“Transite”board of the forms and dimensions shown in Fig.4.5.5 Flask Shield for Electric-Heater DistillationA stain-less steel shield fitted with mica windo
12、ws and cover of thesame construction and dimensions as those for flame distilla-tion(5.4),except for the height of the shield.See Fig.5.5.6 GauzeTwo sheets of 16-mesh wire gauze made with0.51-mm(0.02-in.)diameter Nichrome wire and 125 to 152mm in diameter or square.5.7 Burner Chimney for Flame Disti
13、llationA cylindricalmetal chimney approximately 100 mm high,95 to 105 mm indiameter,and having a peephole 25 mm in diameter centeredabout 32 mm below the ring support,used to protect the flame1This test method is under the jurisdiction of ASTM Committee D-7 on Woodand is the direct responsibility of
14、 Subcommittee D07.06 on Treatments for WoodProducts.Current edition approved Sept.10,1995.Published November 1995.Originallypublished as D 246 26 T.Last previous edition D 246 95.This test method is identical in substance with the Standard Method ofDistillation which is part of the American Wood-Pre
15、servers Association StandardMethods for Analysis of Creosote and Oil-Type Preservatives(A1).Acknowledg-ment is made to the American Wood Preservers Association for its development ofthe subject matter covered in this test method.2Annual Book of ASTM Standards,Vol 04.10.3Annual Book of ASTM Standards
16、,Vol 14.03.4Annual Book of ASTM Standards,Vol 14.02.5The“Precision”Ful-Kontrol 750-W heater with built-in variable transformercontrol has been found satisfactory.This heater is available for 115 V,50/60 Hz only.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.from air currents.The top of the shield should be flanged topermit its being suspended from the ring support.5.8 ReceiversStandard 125-mL conical flasks,specifiedas Type I,Class 1