ASTM_D_3235_-_15.pdf

Designation:D323515Standard Test Method forSolvent Extractables in Petroleum Waxes1This standard is issued under the fixed designation D3235;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.Scope*1.1 This test method covers the determination of solventextractables in petroleum waxes.1.2 The values stated in SI units are to be regarded asstandard.The values given in parentheses are for informationonly.1.3 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:2E1 Specification for ASTM Liquid-in-Glass ThermometersE128 Test Method for Maximum Pore Diameter and Perme-ability of Rigid Porous Filters for Laboratory Use3.Summary of Test Method3.1 The sample is dissolved in a mixture consisting of 50volume%methyl ethyl ketone and 50 volume%toluene.Thesolution is cooled to 32 C(25 F)to precipitate the wax,then filtered.The solvent extractables content is determined byevaporating the solvent from the filtrate and weighing theresidue.4.Significance and Use4.1 The solvent extractables in a wax may have significanteffects on several of its properties such as strength,hardness,flexibility,scuff resistance,coefficient of friction,coefficient ofexpansion,melting point,and staining characteristics.Whetherthese effects are desirable or undesirable depends on theintended use of the wax.5.Apparatus5.1 Filter Stick and Assembly,consisting of a 10 mm diam-eter sintered glass filter stick of 10 m to 15 m maximum porediameter as determined by the method in Appendix X1,provided with an air pressure inlet tube and delivery nozzle.Itis provided with a ground-glass joint to fit a 25 mm by 170 mmtest tube.The dimensions for a suitable filtration assembly areshown in Fig.1.NOTE1A metallic filter stick may be employed if desired.A filterstick3made of stainless steel and having a 12.7 mm(0.50 in.)disk of10 nm to 15 nm maximum pore diameter,as determined by Test MethodE128,has been found to be satisfactory.The metallic apparatus is insertedinto a 25 mm by 150 mm test tube and held in place by means of a cork.5.2 Cooling Bath,consisting of an insulated box with30 mm 6 5 mm(1.2 in.6 0.2 in.)holes in the center toaccommodate any desired number of test tubes.The bath maybe filled with a suitable medium such as kerosine,and may becooled by circulating a refrigerant through coils,or by usingsolid carbon dioxide.A suitable cooling bath to accommodatethree test tubes is shown in Fig.2.5.3 Dropper Pipet,dispensing device capable of delivering0.5 g 6 0.05 g of molten wax.5.4 Transfer Pipet,or equivalent volume dispensing device,capable of delivering 15 mL 6 0.06 mL.5.5 Air Pressure Regulator,designed to supply air to thefiltration assembly(8.5)at sufficient pressure to give an evenflow of filtrate.Either a conventional pressure-reducing valveor a mercury bubbler-type regulator has been found satisfac-tory.The latter type,illustrated in Fig.3,consists of a 250 mLglass cylinder and a T-tube held in the cylinder by means of arubber stopper grooved at the sides to permit the escape ofexcess air.The volume and pressure of the air supplied to thefiltration assembly is regulated by the depth to which the T-tubeis immersed in mercury at the bottom of the cylinder.Absor-bent cotton placed in the space above the mercury prevents the1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.10.0A on Physical/Chemical Properties.Current edition approved April 1,2015.Published April 2015.Originallyapproved in 1973.Last previous edition approved in 2011 as D3235 06(2011).DOI:10.1520/D3235-15.2For 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.3The sole source of supply of a suitable metal filter stick with designatedporosity G known to the committee at this time is the Pall Trinity Micro Corp.,Route 281,Cortland,NY13045.Alist of United Kingdom suppliers can be obtainedfrom Energy Institute,61 New Cavendish St.,London,W1G 7AR,United King-dom.If you are aware of alternative suppliers,please provide this information toASTM International Headquarters.Your comments will receive careful consider-ation at a meeting of the responsible technical committee,1which you may attend.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor D