ASTM_D_1813_-_13.pdf

Designation:D181313Standard Test Method forMeasuring Thickness of Leather Test Specimens1This standard is issued under the fixed designation D1813;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 Department of Defense.1.Scope1.1 This test method covers the measurement of the thick-ness of leather test specimens in which the dimensions of thespecimens are used directly in determining the results of testsfor physical properties.This test method does not apply to wetblue.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D1610 Practice for Conditioning Leather and Leather Prod-ucts for Testing3.Significance and Use3.1 This test method shall be used where precise dimensionsare necessary for calculation of properties expressed in physi-cal units.It is not intended to replace practical thicknessmeasurements based on commercial portable tools,nor is itimplied that thickness measurements made by the two proce-dures will agree exactly.4.Apparatus4.1 Gage,equipped with a dial micrometer,a flat anvil,anda presser foot loaded by a dead mass.34.2 Dial,graduated to read to the nearest 0.01 mm,withsmall second dial graduated to read to the nearest 1 mm or tothe nearest 0.001 in.and 0.1 in.respectively.4.3 Anvil,flat,with a diameter of 0.395 6 0.02 in.(10 6 0.5mm)and projecting 0.1 in.(2.5 mm)from the surface of a flatcircular platform about 2 in.(50 mm)in diameter.4.4 Presser Foot,having a flat surface 0.395 6 0.02 in.(106 0.5 mm)in diameter,and can be lifted by a lever at least 13mm or 0.5 in.It shall be dead-mass loaded to exert a total loadof 13.86 6 0.35 oz(393 6 10 g)on the specimen.The load isequivalent to 500 g/cm2.The contacting surface of the presserfoot and the surface of the anvil shall be parallel within 0.0001in.(0.0025 mm).5.Test Specimen5.1 The test specimen shall be a piece of leather that hasbeen conditioned according to Practice D1610 and cut to thedimensions required for the particular physical test.6.Procedure6.1 Place the specimen on the anvil,and lower the presserfoot gently(do not drop)until it rests on the specimen.Take thereading 5 s after the full load is reached.Read the thickness tothe nearest 0.01 mm or 0.001 in.6.2 Take the number of thickness measurements at thedesired locations as specified in the particular physical testmethod being used.7.Report7.1 The report shall include the following:1This test method is under the jurisdiction of ASTM Committee D31 on Leatherand is the direct responsibility of Subcommittee D31.07 on Physical Properties.Thistest method was developed in cooperation with theAmerican Leather ChemistsAssn(Standard Method E41983).Current edition approved May 1,2013.Published May 2013.Originallyapproved in 1960.Last previous edition approved in 2010 as D1813 00(2010).DOI:10.1520/D1813-13.2For 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.3The sole source of supply of the dead-mass type gage known to the committeeat this time is B.C.Ames,Model#70-1355(formerly Frank E.Randall Co.,Inc.)1644 Concord Street,Framingham,MA 01701.If you are aware of alternativesuppliers,please provide this information to ASTM Headquarters.Your commentswill receive careful consideration at a meeting of the responsible technicalcommittee,1which you may attend.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 7.1.1 Thickness of each specimen,reported as the averageof the thickness measurements taken,and7.1.2 Thickness of the sample,if pertinent,reported as theaverage thickness of all the specimens measured.8.Precision8.1 The coefficient of variation of measurements of thick-ness of consecutive specimens by this method is less than5.0%.9.Keywords9.1 leather;thicknessASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this 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 responsibilit