1、Designation: D7912 14Standard Test Method forResistance of Finish to Heat Aging (Finish Stability)1This standard is issued under the fixed designation D7912; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision
2、. 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 resistanceof leather finish to cracking, flaking or becoming tacky afteraging.1.2 The
3、values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.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
4、 safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D1517 Terminology Relating to LeatherD1610 Practice for Conditioning Leather and Leather Prod-ucts for TestingD2813 Practice for Sampling Leather for Physic
5、al andChemical Tests2.2 Federal Test Method:3Standard No 311 Method 3202 Finish Stability3. Terminology3.1 DefinitionsFor definitions of leather terms see Termi-nology D1517.4. Summary of Test Method4.1 In this test method the finish is visually examined afterthe test specimen is exposed to prolonge
6、d heating, followed bymanual flexing of the specimen.5. Significance and Use5.1 This test method is intended for use on all types offinished leathers.5.2 Finish stability is a significant factor in establishing theapplication and function of leather.6. Apparatus6.1 Forced Circulating Air Oven, capab
7、le of maintaining atemperature of 55 to 60C with a thermo regulator systemcapable of holding oven temperature within 62C of set point.A thermometer accurate to 62C should be used to check andmonitor the oven set point.6.2 Steel Stamp Die, 10+2cm2.7. Sampling, Test Specimens, and Test Units7.1 Primar
8、y Sampling UnitThe leather shall be sampledin accordance with Practice D2813.7.2 Suggested sample size is 10 cm2.NOTE 1If necessary, small size may be used. Sample size used shouldbe included in the report.8. Preparation of Apparatus8.1 Preheat the oven (6.1) to the desired temperature.9. Conditioni
9、ng9.1 Prior to cutting the specimens, condition the leather inaccordance with Practice D1610.10. Procedure10.1 Place the specimen to be tested in the circulating airoven maintained at a temperature of 55 to 60C, hanging it sothat complete circulation of the air around the specimen ispossible. Expose
10、 the specimen in this manner for 24 614 h andthen allow it to cool. After cooling, double the aged leatherover with the grain side in, crease the folded edge by handslightly, and rub the finish grain surface together. Examine thegrain surface for cracks, parting of the finish from the leather,and ta
11、ckiness.11. Report11.1 The presence of cracks, parting of the finish from theleather, or tackiness shall be reported.1This test method is under the jurisdiction of ASTM Committee D31 on Leatherand is the direct responsibility of Subcommittee D31.05 on Upholstery. This testmethod is adopted from the
12、FTMS 311 Method 3202.Current edition approved April 1, 2014. Published May 2014. DOI: 10.1520/D7912-142For 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
13、Document Summary page onthe ASTM website.3Available from http:/ ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States111.2 Report sample size used.12. Precision and Bias12.1 This test method is adopted from the procurementprocedures of the Federal Go
14、vernment (Federal Test MethodStandard No 311), where it has long been in used and where itwas approved for publication before the inclusion of precisionand bias statement were mandated. The original inter-laboratory test data is no longer available. The user is cautionedto verify by use of reference
15、 material, if available, that theprecision and bias of this test method is adequate for thecontemplated use.13. Keywords13.1 aging; cracking; finish; leather; tackinessASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin t
16、his standard. Users of this standard 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
17、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 there
18、sponsible technical committee, 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,
19、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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).D7912 142
