ASTM_D_1737_-_85_scan.pdf

ASTM DI737 85 m 2575532 0025012 3 m.-.-.-.-.-I ff-.-0q-1.3 Designation:D 1737-85-I I.-.-.AMERICAN SOCIETY FOR TESTING AND MATERIALS 1916 Race St.,Philadelphia,Pa.,19103 Reprinted from the Annual Book of AST-WI Standards,Copyright ASTM If not listed io the current combined index,will appeatin the next edition.-.Standard Test Method for ELONGATiBN OF ATTACHED ORGANIC COATINGS WITH CYLINDRICAL MANDREL APPARATUS This standard is issued under the fixed designation D 1737:the number immediately following the designation indicates the year of original adoption or,in the case of revision.the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon(e)indicates an editorial change since the last revision or reapproval.Tliis test merliod lias been approved for iise by ageticies o f the Department o f Ddense to replace Melhod 6222 o f Federal Test Meiliod Standard No.141.4 and for listing in lhe DoD index of SpeciJicaiions and Standards.1.Scope 1.1 This test method covers the determination by the cylindrical test apparatus of the elongation of attached organic coatings when applied to flat sheet metal of uniform surface texture.1.2 This standard may involve hazardous ma-terials,operafions,and equipment.This standard does not purport to address all oJthe safity prob-lems associated with its use.It is the responsibil-ity o f whoever uses this standard to consult and establish appropriate sajty and health practices and determine lhe applicability o f regulatory limi-tations prior to use.2.Applicable Documents 2.1 ASTM Standards:D823 Methods of Producing Films of Uni-form Thickness of Paint,Varnish,Lacquer,and Related Products on Test Panels2 D 1005 Test Method for Measurement of Dry-Film Thickness of Organic Coatings Using Micromete3 D 1 186 Methods for Nondestructive Measure-ment of Dry Film Thickness of Nonmag-netic Coatings Applied to a Ferrous Base2 3.Summary of Method 3.1 The materials under test are applied at uniform thickness to flat sheet metal panels.After the coatings are dried or baked,the panels are bent over cylindrical mandrels of various diameters.The elongation is determined from the largest diameter mandrel that produces visi-ble cracking in the coating.4.Significance and Use 4.1 Coatings attached to substrates are elon-gated when the substrates are bent during the manufacture of articles or when the articles are abused in service.This test method has been useful in rating attached coatings for their ability to resist cracking when elongated.It has been useful in evaluating the flexibility of coatings on flexible substrates.5.Apparatus3 5.1 Automatic Application Equipment,as de-scribed in Methods D 823.5.2 Film Thickness Measuring Apparatus,as described in Test Method D 1005 or in Methods D 1186,5.3 Elongation Test Equipment,consisting of six cylindrical steel rods having diameters of I in.(25 mm),3 4 in.(19 mm),Y2 in.(12.7 mm),3/8 in.(9.5 mm),h in.(6.4 mm),and Y8 in.(3.2 mm),and a means for firmly supporting them during a test.6.Preparation of Specimens 6.1 Apply the materials to be tested to cold rolled steel(Note 1)conforming to the chemical This test method is under the jurisdiction of ASTM Com-mittee D-l on Paint and Related Coatings and Materials and is the direct responsibility of Subcommittee W I.23 on Physical Properties of Applied Paint Films.Current edition approved Sept.27.1985.Published Novem-ber 1985.Oiignaliy published as D 1737-60 T.Last previous edition D 1737-62(1979)c1.Amiral Book o f ASTM Standards,Vol 06.0 1.Suitable apparatus may be obtained from laboratory instru-ment supply houses.NOTICE:This standard has either been superseded and replaced by a new version or discontinued.Contact ASTM International(www.astm.org)for the latest information.ASTM D3737 85 M 2575532 0025033 3 M-.-requirements of SAE steel No,1Ol:dead soft,finish A,*/3z in.(0.8 mm)in thickness(22 gage).The surface preparation of the metal shall be agreed upon by the purchaser and the seller.Prior to the application of the finish the edges of the panel shall be rounded slightly to remove burrs in order to eliminate anomalous edge effects.Apply uniform coatings of the materials in ac-cordance with Methods D823 and air dry or bake under conditions of humidity and temper-ature mutually agreeable to the purchaser and seller.NOTE 1-Other suitable base materials for the test specimen may be employed.This method is designed for testing materials on Y32-in.(0.8 mm)cold rolled steel.The method for determining the percent of elon-gation of coatings applied to base materials other than the steel or thickness specified in Section 5 is described in the Appendix.7.Conditioning and Number of Tests 7.1 Condition the test panels for at least 24 h at 73.5 f:3.5F(23 2C)and 50 rc:5%relative humidity,and test in the same environment or immediately on removal therefrom unless other-wise specified by the purchaser and the seller.Test at least two replicate specimens at each diameter of interest