1、Designation: D 5557 95 (Reapproved 2006)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 D 5557; the number immediately following the designation indicates the year o
2、foriginal 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.1. Scope1.1 This test method covers the determination of the amountof
3、 impurities that 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, assoc
4、iated 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:2D56 Test Method for Flash Point by Tag Closed Cup TesterD
5、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 s
6、tuffing 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 temperatu
7、re, and weighed.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, pre
8、pared as in 4.1, before using.5. Procedure5.1 Use the residue from the moisture and volatile determi-nation (see Test Method D 5556) 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
9、 crucible with the aid 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
10、constant weight at 101 6 1C, cool to roomtemperature in a desiccator, and weigh.6. Calculation and Report6.1 Report the calculation of insoluble impurities as per-centage:% insoluble impurities 5gain in weight of crucible 3 100weight of sample taken for moisture(1)6.2 Reference this test method in t
11、he test report.7. Precision and Bias7.1 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 originalinterlaboratory test data ar
12、e 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; petroleumether1This test method
13、is under the jurisdiction of ASTM Committee D31 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, 2006. Published April 2006. Ori
14、ginallyapproved in 1994. Last previous edition approved in 2001 as D 5557 95(2001).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 pa
15、ge onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this sta
16、ndard are expressly advised that determination of the validity 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 an
17、dif 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 theresponsible technical committee,
18、which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D 5557 95 (2006)2
