1、Designation:D46415(Reapproved 2020)Standard Test Methods forSaponification Number of Pine Chemical Products IncludingTall Oil and Other Related Products1This standard is issued under the fixed designation D464;the number immediately following the designation indicates the year oforiginal adoption or
2、,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.Scope1.1 These test methods cover the determination of thesaponification number of tall oil and
3、 products obtained by thefractionation of tall oil such as rosin,fatty acids and distilledtall oil as defined in Terminology D804.These test methods arealso applicable to gum and wood rosin.Two test methods arecovered as follows:1.1.1 Test method using a potentiometric method,and1.1.2 Test method us
4、ing an internal indicator method.1.2 The potentiometric method is suitable for use with bothlight-and dark-colored test samples.It should be consideredthe referee method.The internal indicator method is suitablefor use only with light-and medium-colored test samples.Itshould be considered the altern
5、ate method.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 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 establi
6、sh appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for
7、theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D803 Test Methods for Testing Tall OilD804 Terminology Relating to Pine Chemicals,IncludingTall Oil and Rela
8、ted ProductsE70 Test Method for pH of Aqueous Solutions With theGlass Electrode3.Significance and Use3.1 These test methods are designed to broaden the scope ofthe earlier editions of the test method by the inclusion of tall oiland tall oil derived products as test materials and is referencedin Test
9、 Methods D803.3.2 The saponification number is an important property oftall oil and the products obtained by the fractionation of tall oil.It is the test method widely used to determine the total acidcontent,both free and combined,of these products.3.3 The potentiometric test method should be used w
10、hen themost reproducible results are required.4.Preparation of Sample4.1 If the sample for analysis is rosin,it shall consist ofsmall pieces of rosin chipped from a freshly exposed part of alump or lumps,and thereafter crushed to facilitate weighingand dissolution.Prepare the sample the same day on
11、which thetest is begun in order to avoid changes in properties due tosurface oxidation.Changes are very pronounced on groundrosin that has a large surface area exposed to air.Existing rosindust and powdered rosin must not be used.4.2 If the sample is a nonhomogeneous liquid,heat theentire sample in
12、a closed container fitted with a capillary ventor the equivalent.Some kind of agitation,even if doneoccasionally by hand,saves much time.Heat by immersion inopen steam or hot water bath to avoid overheating.Whendealing with crystallized rosin,a higher temperature of ap-proximately 160C may be needed
13、.Remove samples fortesting only when the entire sample is homogeneous and hasbeen well stirred.5.Purity of Reagents and Water5.1 Unless otherwise indicated,it is intended that all re-agents shall conform to the specifications established by theCommittee on Analytical Reagents of the American Chemica
14、l1These test methods are under the jurisdiction of ASTM Committee D01 onPaint and Related Coatings,Materials,and Applications and are the directresponsibility of Subcommittee D01.34 on Pine Chemicals and HydrocarbonResins.Current edition approved June 1,2020.Published June 2020.Originallyapproved in
15、 1937.Last previous edition approved in 2015 as D464 15.DOI:10.1520/D0464-15R20.2For 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
16、 ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.Society,3where such specifications are available.References towa
