1、Designation:D237098(Reapproved 2010)Standard Test Method forTensile Properties of Organic Coatings1This standard is issued under the fixed designation D2370;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A
2、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 determination of the elon-gati
3、on,tensile strength,and stiffness(modulus of elasticity)oforganic coatings when tested as free films.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 consi
4、dered 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.Spe
5、cific hazardstatements are given in Section 7.2.Referenced Documents2.1 ASTM Standards:2D823 Practices for Producing Films of Uniform Thicknessof Paint,Varnish,and Related Products on Test PanelsD882 Test Method for Tensile Properties of Thin PlasticSheetingD1005 Test Method for Measurement of Dry-F
6、ilm Thick-ness of Organic Coatings Using MicrometersD3980 Practice for Interlaboratory Testing of Paint andRelated Materials(Withdrawn 1998)3D4708 Practice for Preparation of Uniform Free Films ofOrganic Coatings3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 elongation,nthe in
7、crease in specimen length fromthe point of initial load application to the point of film rupturein a tension test.3.1.2 gage length,nthe initial length of the test specimenbetween the jaws of the tensile tester.3.1.3 stiffness(modulus of elasticity),nthe load per unitarea required to elongate the fi
8、lm 1%from the first point in thestress-strain curve where the slope becomes constant.3.1.4 stress-strain curve,nthe curve resulting from a plotof tensile load against the distance of jaw separation(elonga-tion of specimen).3.1.5 tensile strength(nominal),nthe load per originalunit area at which a sp
9、ecimen fails or yields in a tension(pull)test.4.Summary of Test Method4.1 Free unsupported films of the materials to be tested areprepared.The tensile properties of the free films are determinedby means of a tensile testing apparatus.5.Significance and Use5.1 Tensile properties determined by this me
10、thod are ofvalue in studying the behavior of coatings subjected to envi-ronmental stresses,such as those produced by aging andweathering.(See Refs.(1-10).)45.2 Tensile properties may vary with specimen thickness,method of preparation,gage length,rate of load application,tensile tester response,and t
11、ype of grips used.Consequently,where precise comparative results are desired,these factorsmust be carefully controlled.6.Apparatus6.1 Equipment for applying films of uniform thickness asdescribed in Practices D823.6.2 Micrometer Film Thickness Gage as described in TestMethod D1005.1This test method
12、is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.23 on Physical Properties of Applied Paint Films.Current edition approved Dec.1,2010.Published December 2010.Originallyapproved in 1965.Last pre
13、vious edition approved in 2002 as D2370 98(2002)1.DOI:10.1520/D2370-98R10.2For 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
14、website.3The last approved version of this historical standard is referenced onwww.astm.org.4Boldface numbers in parentheses refer to the list of references at the end of thisstandard.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.3 Te
15、nsile Tester of the constant rate of jaw separation type,equipped with load cells having capacities of 0.2 to 4.4 lb(100to 2000 g),and equipped with an indicating device such as anelectronic constant speed chart recorder,a digital device thatdisplays numerical values,or a printer that records the nu
16、meri-cal values.6.4 Precision Specimen Cutter having a double blade with afoot to hold the sample in place.56.5 Alternative Substrates on which test material can bedeposited.6.5.1 Dental Tin Foil,preferably 1 mil(25 m)thick.66.5.2 Sheet of FEP(fluorinated ethylene-propylene),7pref-erably 2 mils(50 m)thick,coated with a dry lubricant.8NOTE1Other substrates that may be suitable are 10-mil(250-m)thick polyethylene(7),photographic paper(8),polished steel(9),andfluoropolymer coated metal panels.7.Haz