ASTM_D_3170_-_D_3170M_-_14.pdf

Designation:D3170/D3170M14Standard Test Method forChipping Resistance of Coatings1This standard is issued under the fixed designation D3170/D3170M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript 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 coatings to chipping damage by stones or other flyingobjects.NOTE1This test method is similar to SAE J-400.1.2 All dimensions are nominal unless otherwise specified.1.3 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.4 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:2D609 Practice for Preparation of Cold-Rolled Steel Panelsfor Testing Paint,Varnish,Conversion Coatings,andRelated Coating ProductsD823 Practices for Producing Films of Uniform Thicknessof Paint,Varnish,and Related Products on Test PanelsD1005 Test Method for Measurement of Dry-Film Thick-ness of Organic Coatings Using MicrometersD1186 Test Methods for Nondestructive Measurement ofDry Film Thickness of Nonmagnetic Coatings Applied toa Ferrous Base(Withdrawn 2006)3D1400 Test Method for Nondestructive Measurement of DryFilm Thickness of Nonconductive Coatings Applied to aNonferrous Metal Base(Withdrawn 2006)3D1733 Method for Preparation of Aluminum Alloy Panelsfor Testing Paint,Varnish,Lacquer,and Related Products(Withdrawn 1979)3D2201 Practice for Preparation of Zinc-Coated and Zinc-Alloy-Coated Steel Panels for Testing Paint and RelatedCoating Products2.2 Other Documents:Test for Chip Resistance of Surface Coatings(J-400)43.Summary of Test Method3.1 Standardized road gravel is projected by means of acontrolled air blast at the coated specimens.All testing isconducted under controlled temperature conditions,generallyeither at ambient(room)temperature or at-29 6 3C-20 65F.After the gravel impact,tape is applied to remove anyloose coating chips and the degree of chipping is determined.4.Significance and Use4.1 Owners consider chipping of coatings,particularly onthe leading faces and edges of automobile surfaces,unaccept-able.In formulating a coating or coating system to meet servicerequirements,the resistance to chipping damage by flyingobjects such as gravel is one of the properties of importancesince it can vary considerably as other properties are adjusted.Since resistance to chipping decreases at lower temperaturespartly as the result of decreased flexibility,the test may bemore directly related to service conditions by performing it at1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.55 on Factory Applied Coatings on Preformed Products.Current edition approved June 15,2014.Published July 2014.Originallyapproved in 1973.Last previous edition approved in 2012 as D3170 12.DOI:10.1520/D3170_D3170M-14.2For 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 last approved version of this historical standard is referenced onwww.astm.org.4Available from Society of Automotive Engineers(SAE),400 CommonwealthDr.,Warrendale,PA 15096-0001,http:/www.sae.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 a low temperature.This test method is designed to produce acontrolled amount of impact by the media on the coated panelin order to enhance reproducibility.5.Apparatus5.1 Gravel-Projecting Machine(Gravelometer),con-structed according to the design specifications shown in Fig.1.5,6There are two types of Gravelometers:the old cabinetstyle and the newer,modular style with an electronic feedmechanism.NOTE2It is recommended that the operation/maintenance checklistshown in Appendix X1 should be completed at least once per month forgravelometers that are operated on a weekly basis,and once every 6months for gravelometers that are operated less frequently.Note thatvalues in the checklist are specific to the standard gravel testing protocol.Different specifications may be necessary for other media