ASTM_D_1640_-_D_1640M_-_14_2022.pdf

Designation:D1640/D1640M14(Reapproved 2022)Standard Test Methods forDrying,Curing,or Film Formation of Organic Coatings1This standard is issued under the fixed designation D1640/D1640M;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 These test methods cover the determination of thevarious stages and rates of film formation in the drying orcuring of organic coatings under laboratory controlled condi-tions of air temperature,(low,ambient and/or elevated)and/orhumidity.Procedures for assessing drying under prevailingconditions of temperature and humidity in the shop and fieldare also described.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system are not necessarily exact equivalents;therefore,toensure conformance with the standard,each system shall beused independently of the other,and values from the twosystems shall not be combined.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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 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:2D823 Practices for Producing Films of Uniform Thicknessof Paint,Coatings and Related Products on Test PanelsD4414 Practice for Measurement of Wet Film Thickness byNotch Gages2.2 ISO Standards:3ISO 91174 Paints and varnishes Determination of drying Part 4:Method using a mechanical recorder3.Significance and Use3.1 These test methods can be used to determine the variousstages and rates of drying,curing,and film formation oforganic coatings for comparing types of coatings,assessing theimpact of compositional changes on drying time,or forassessing drying/curing time in the shop or field.Low tem-perature can significantly slow the drying rate of coatings solow temperature curing agents,catalysts and/or accelerators areoften available to aid drying and film formation under coolertemperatures.Method B is designed to evaluate these compo-nents and/or to determine the effect of cooler temperatures ondrying rates.Conversely,the drying/curing rate of certaincoatings can be accelerated under elevated temperature/humidity conditions,while others may be adversely impactedby elevated humidity.Method C is designed to evaluate theeffects of elevated temperature and relative humidity condi-tions on drying,curing,and film formation of paints andcoatings.The terms dry or drying,cure or curing,and filmformation are used interchangeably throughout this standard.3.2 Test Methods A,B and C are limited to a comparison ofpaints/coatings applied to smooth,non-absorbent substratesand do not reflect the effect of absorption of the paint vehicleinto the substrate material.4.Substrate,Coating Application Method and FilmThicknesses4.1 Obtain agreement between the contracting parties as tothe substrate,wet film thickness(WFT),and applicationmethod for testing the specific coating involved.The product istested as manufactured(without reducer,unless otherwiseagreed upon by contracting parties).Unless otherwise agreed,the thickness of the cast film shall conform to the coatingmanufacturers product data sheet.If the wet film thickness isnot stated on the manufacturers product data sheet,it can be1These test methods are under the jurisdiction of ASTM Committee D01 onPaint and Related Coatings,Materials,and Applications and are the directresponsibility of Subcommittee D01.23 on Physical Properties of Applied PaintFilms.Current edition approved June 1,2022.Published June 2022.Originallyapproved in 1959.Last previous edition approved in 2018 as D1640/D1640M 14(2018).DOI:10.1520/D1640_D1640M-14R22.2For 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.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.Copyright 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 standardiza