ASTM_D_6116_-_18.pdf

Designation:D611618Standard Test Method forBlocking1This standard is issued under the fixed designation D6116;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()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This test method covers the determination of the resis-tance of leather to blocking under specific conditions oftemperature,humidity,and pressure.This test method does notapply to wet blue.1.2 The 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 safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization 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 AATCC Standard:2AATCC TM15 Colorfastness to Perspiration3.Apparatus3.1 Forced Circulating Hot Air Oven,capable of maintain-ing 80 6 3C.3.2 American Medical Museum Jar(with Lid),having innerdimensions of 16 cm high,10 cm long,and 8 cm wide.Thereshall be three indentations at the top of each 8 cm side.Otherglass containers similar in size may be used,provided they givethe same result.3.3 Petri Dish,100 by 15 mm,with cover.3.4 Weight,2000 g.3.5 Perspirometer,consisting of a number of glass plateswhich can be kept in suitable compression loading frame.Anyother apparatus may be used,provided it gives the sameresults;for example,the AATCC perspirometer tester asdescribed in AATCC TM15,which is commercially available.4.Test Specimen4.1 Test four specimens per sample with dimensions of 2.5by 10 cm.Two samples shall be parallel to the backbone,andtwo samples perpendicular to the backbone.If material islimited,one specimen per direction is suitable.5.Procedure5.1 The specimen shall be perforated 2 mm from one endand hung on a standard size paper clip that has been opened toits full length.No more than five specimens shall be hung onone clip.The clip holding the specimen shall be set into theindentations of the jar.No more than three clips shall be placedin a jar.The jar shall be filled with distilled/deionized water at23 6 2C to a level no higher than 1.25 cm from the bottom ofthe hanging specimen.The lid shall then be placed on the jarand the specimen allowed to condition for 4 h.5.2 After conditioning,the 2.5 by 10 cm specimen shall beremoved from the jar and immediately folded finish to finish toform a 2.5 by 5 cm rectangle.If the leather is unable to befolded upon itself(too thick or stiff),it may be cut to 2.5 by 5cm sections and placed finish to finish.Follow Method 1 orMethod 2 from this section forward.35.3 Method 1(Petri Dish Method):5.3.1 The folded specimen shall then be placed in aninverted(rim up)petri dish cover.The bottom plate of the dishshall then be placed concentrically within the inverted coverplate so as to cover the specimen evenly.5.3.2 A 2000 g weight shall be placed on top of the invertedbottom plate.The whole assembly shall then be placed in anoven at 80 6 3C for 2 h and then removed.The weight andcover plate shall be removed from the assembly and thespecimen allowed to cool for 30 min.1This test method is under the jurisdiction of ASTM Committee D31 on Leatherand is the direct responsibility of Subcommittee D31.05 on Upholstery.Current edition approved Nov.1,2018.Published December 2018.Originallyapproved in 1997.Last previous edition approved in 2016 as D6116 00(2016).DOI:10.1520/D6116-18.2Available from American Association of Textile Chemists and Colorists(AATCC),P.O.Box 12215,Research Triangle Park,NC 27709-2215,http:/www.aatcc.org.3DoD has only adopted Method 1.Copyright 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 Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 5.3.3 The cooled and folded specimen shall be examined byslowly pulling the fold apart by hand.The specimen shall beexamined for ease of separation,grain damage,and finishpeeling.5.4 Method 2(Perspirometer Method):5.4.1 The finish to finish folded samples(5.2)can alterna-tively be placed