ASTM_A_755_-_A_755M_-_18.pdf

Designation:A755/A755M18Standard Specification forSteel Sheet,Metallic Coated by the Hot-Dip Process andPrepainted by the Coil-Coating Process for ExteriorExposed Building Products1This standard is issued under the fixed designation A755/A755M;the number immediately following the designation indicates the yearof 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()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.Scope*1.1 This specification covers steel sheet metallic coated bythe hot-dip process and coil-coated with organic films forexterior exposed building products.Sheet of this designation isfurnished in coils,cut lengths,and formed cut lengths.Build-ing products include corrugated and various types of roll andbrake-formed configurations.1.2 The substrate is available in several different metallic-coated steel sheet products as enumerated in 4.1,depending onthe requirements of the purchaser.1.3 Coating systems supplied under this specification con-sist of a primer coat covered by various types and thicknessesof top coats.The combination of primer and top coat is classedas either a two-coat thin-film system or as a two-coat(or more)thick-film system.Typical top-coating materials are:polyester,silicone polyester,acrylic,fluoropolymer,plastisol,or polyure-thane.1.4 This specification is applicable to orders in eitherinch-pound units(as A755)or SI units as A755M.Values ininch-pound units and SI units are not necessarily equivalent.Within the text,SI units are shown in brackets.Each systemshall be used independently of each other.1.5 Unless the order specifies the“M”designation(SIunits),the product shall be furnished to inch-pound units.1.6 The text of this specification references notes andfootnotes that provide explanatory material.These notes andfootnotes,excluding those in tables and figures,shall not beconsidered as requirements of this specification.1.7 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.1.8 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 ASTM Standards:2A463/A463M Specification for Steel Sheet,Aluminum-Coated,by the Hot-Dip ProcessA653/A653M Specification for Steel Sheet,Zinc-Coated(Galvanized)or Zinc-Iron Alloy-Coated(Galvannealed)by the Hot-Dip ProcessA792/A792M SpecificationforSteelSheet,55%Aluminum-Zinc Alloy-Coated by the Hot-Dip ProcessA875/A875M Specification for Steel Sheet,Zinc-5%Alu-minum Alloy-Coated by the Hot-Dip ProcessA902 Terminology Relating to Metallic Coated Steel Prod-uctsA924/A924M Specification for General Requirements forSteel Sheet,Metallic-Coated by the Hot-Dip ProcessA1046/A1046M Specification for Steel Sheet,Zinc-Aluminum-MagnesiumAlloy-Coated by the Hot-Dip Pro-cessA1063/A1063M Specification for Steel Sheet,Twin-RollCast,Zinc-Coated(Galvanized)by the Hot-Dip ProcessB117 Practice for Operating Salt Spray(Fog)ApparatusD522 Test Methods for Mandrel Bend Test of AttachedOrganic CoatingsD523 Test Method for Specular GlossD659 Method for Evaluating Degree of Chalking of Exterior1This specification is under the jurisdiction of ASTM Committee A05 onMetallic-Coated Iron and Steel Products and is the direct responsibility ofSubcommittee A05.11 on Sheet Specifications.Current edition approved Nov.1,2018.Published December 2018.Originallyapproved in 1978.Last previous edition approved in 2016 as A755/A755M 16.DOI:10.1520/A0755_A0755M-18.2For 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.*A Summary of Changes section appears at the end of this standardCopyright 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 Paints(Withdrawn 1990)3D714 Test Method for Evaluating Degree of Blistering ofPaintsD822 Practice for Filtered Open-Flame Carbon-Arc Expo-sures of Paint and Related CoatingsD870 Practice for Testing