1、Designation:D555795(Reapproved 2017)Standard Test Method forDetermination of Insoluble Impurities Contained in Fats andOils Used in Fat Liquors and Stuffing Compounds1This standard is issued under the fixed designation D5557;the number immediately following the designation indicates the year oforigi
2、nal 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.Scope1.1 This test method covers the determination of the amountof impurities th
3、at are insoluble in kerosine and petroleum ethercontained in fats and oils.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 us
4、e.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.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-iza
5、tion established in the Decision on Principles for 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:2D56 Test Method for Flash Point by Tag Closed Cup TesterD
6、5556 Test Method for Determination of the Moisture andOther Volatile Matter Contained in Fats and Oils Used inFat Liquors and Softening Compounds3.Significance and Use3.1 This test method is intended for the determination ofinsoluble impurities contained in fats and oils used in thefatliquors and st
7、uffing compounds.4.Apparatus and Reagents4.1 Gooch Crucible,prepared with a fine or very finefiltering disc(0.7 m retention value).The filtering disc shallbe washed with water,alcohol,and ether.The crucible shall bedried to constant weight at 101 6 1C,cooled in a desiccatorto room temperature,and we
8、ighed.4.2 Filter-Flask,of convenient size and Gooch crucibleadapter.4.3 Petroleum Ether.4.4 Kerosine,refined petroleum distillate with a flash pointnot below 23C(75F)as determined by Test Method D56using the tag closed tester.The kerosine shall be filteredthrough a Gooch crucible,prepared as in 4.1,
9、before using.5.Procedure5.1 Use the residue from the moisture and volatile determi-nation(see Test Method D5556)or a sample prepared in thesame manner.5.2 Add to the residue 50 mL of kerosine and,after heatingon a water bath to dissolve the fat,filter through the preparedGooch crucible with the aid
10、of a vacuum.Wash the contents ofthe crucible with five 10 mL portions of hot kerosine,allowingeach portion to drain before adding the next.5.3 Then wash the residue in the crucible thoroughly withpetroleum ether to remove all of the kerosine.Dry the crucibleand contents to constant weight at 101 6 1
11、C,cool to roomtemperature in a desiccator,and weigh.6.Calculation and Report6.1 Report the calculation of insoluble impurities as per-centage:%insoluble impurities5gain in weight of crucible3100weight of sample taken for moisture(1)6.2 Reference this test method in the test report.7.Precision and Bi
12、as7.1 This test method is adopted from the procedures of theAmerican Leather ChemistsAssociation where it has long beenin use and was approved for publication before the inclusion ofprecision and bias statements was mandated.The original1This test method is under the jurisdiction of ASTM Committee D
13、31 on Leatherand is the direct responsibility of Subcommittee D31.08 on Fats and Oils.This testmethod was developed in cooperation with the American Leather Chemists Assn.(Method H 211957).Current edition approved April 1,2017.Published April 2017.Originallyapproved in 1994.Last previous edition app
14、roved in 2011 as D5557 95(2011).DOI:10.1520/D5557-95R17.2For 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.Copyright
15、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 Standa
16、rds,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 interlaboratory test data are no longer available.The user iscautioned to verify by the use of reference materials,ifavailable,that the precision and bias(or reproducibility)of thistest method is adequate for the contemplated use.8.Keywords8.1 fats and oils;impurities;kerosine;leather;petroleumetherASTM International takes no position respecting the validity of any patent rights asse
