1、Designation:D555795(Reapproved 2011)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.2.Referenced Documents2.1 ASTM Standards:2D56 Test Method for Flash Point by Tag Closed Cup TesterD5556 Test Method for
5、 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 stuffing compounds.4.A
6、pparatus 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 weighed.4.2 Filter-Fla
7、sk,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,before using.5.Proce
8、dure5.1 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 of a vacuum.Wash the
9、 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 1C,cool to roomtemper
10、ature 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 Bias7.1 This test meth
11、od 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 originalinterlaboratory test data are no longer available.The user iscautioned to verify by
12、 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;petroleumether1This test method is under the jurisdiction of ASTM Committee D31 on Leatherand is
13、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 Jan.1,2011.Published March 2011.Originallyapproved in 1994.Last previous edition approved in 2006 as D5557
14、 95(2006).DOI:10.1520/D5557-95R11.2For 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 ASTM International,100
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16、ty of any such patent rights,and the riskof 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 International Headquarters.Your comments will receive careful consideration at a meeting of t
