ASTM_D_1964_-_85_1995e1.pdf

Designation:D 1964 85(Reapproved 1995)e1Standard Test Method forTung Oil Quality1This standard is issued under the fixed designation D 1964;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(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.e1NOTEUnit of measurement statement was added editorially in May 1995.1.Scope1.1 This test method covers the determination of the qualityof tung oil by distinguishing between pure and adulterated oil.The test method is not applicable to oils other than tung oil.1.2 The values stated in SI units are to be regarded as thestandard.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:E 1 Specification for ASTM Thermometers23.Significance and Use3.1 Since tung oil contains a high degree of conjugatedunsaturation,it will form a dry gel when subjected to elevatedtemperatures for a relatively short time.This test method isdesigned to detect adulteration of tung oil with less conjugatedoils,since an adulterated tung oil will require a longer gel timeand will give a gel that is soft and sticky.3.2 This test method is extremely temperature sensitive andtherefore the temperature must be accurately controlled.4.Apparatus4.1 CasseroleAn ordinary vitreous-enameled iron casse-role having a bottom diameter of 75 mm(3 in.).4.2 Tripod,wide-flange,with a 75-mm(3-in.)opening.NOTE1The object of the flange is to prevent superheating of the sidesof the casserole.4.3 ThermometerAn ASTM Low Distillation Thermom-eter having a range from 2 to 300C and conforming to therequirements for Thermometer 7C as prescribed in Specifica-tion E 1.5.Procedure5.1 Weigh 150 g of the oil into the casserole and heat so thatthe temperature reaches 282C in 4 min 6 30 s while stirringwith the thermometer.Turn down the flame and maintain thetemperature at 282 6 1C.Stir with the thermometer until,onlifting the thermometer,the oil drops with a pronounced string,showing that polymerization has started.The time requiredafter reaching 282 6 1C until the string is noted is the time ofthe heat test.For pure tung oils this will not exceed 8 min.5.2 As soon as the oil strings,turn off the flame and removethe thermometer.Stir with a stiff spatula until the oil is solid.After stringing,a pure tung oil will require not over 40 s tobecome solid.5.3 When the oil has solidified,allow to stand exactly 1 min.Turn out upside down on clean paper and cut at once with aclean spatula.Pure tung oil gives a gel that is dry,not adheringto the spatula when cut.It is firm,crumbling under pressure ofthe spatula,without sticking.The crumbs should have anappearance like dry bread crumbs.Adulterated tung oil gives agel that is soft and sticky and does not crumble.6.Precision and Bias6.1 Precision and bias data were not established at the timethis test method was written.This test method has been in usefor many years and its usefulness has been well established.7.Keywords7.1 tung oil1This test method is under the jurisdiction of ASTM Committee D-1 on Paintand Related Coatings,Materials,andApplications,and is the direct responsibility ofSubcommittee D01.32 on Drying Oils.Current edition approved May 31,1985.Published July 1985.Originallypublished as D 1964 61 to replace Sections 5255 of D 55558.Last previousedition D 1964 61(1984).2Annual Book of ASTM Standards,Vol 14.03.1AMERICAN SOCIETY FOR TESTING AND MATERIALS100 Barr Harbor Dr.,West Conshohocken,PA 19428Reprinted from the Annual Book of ASTM Standards.Copyright ASTMThe American Society for Testing and Materials takes no position respecting the validity of any patent rights asserted in connectionwith any item mentioned in this standard.Users of this standard are expressly advised that determination of the validity of any suchpatent rights,and the risk of infringement of such rights,are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised,either reapproved or withdrawn.Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM Headquarters.Your comments will receive careful consideration at a meeting of the responsibletechnical committee,which you may attend.If you feel that your comments have not received a fair hearing you should make yourviews known to the ASTM Committee on Standards,100 Barr Harbor Drive,West Conshohocken