ASTM_D_3732_-_82_2011.pdf

Designation:D373282(Reapproved 2011)Standard Practice forReporting Cure Times of Ultraviolet-Cured Coatings1This standard is issued under the fixed designation D3732;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A 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 practice applies to all coatings cured by ultravioletenergy.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.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.2.Referenced Documents2.1 ASTM Standards:2D658 Test Method for Abrasion Resistance of OrganicCoatings by Air Blast Abrasive(Withdrawn 1996)3D968 Test Methods for Abrasion Resistance of OrganicCoatings by Falling AbrasiveD1474 Test Methods for Indentation Hardness of OrganicCoatingsD2197 Test Method for Adhesion of Organic Coatings byScrape AdhesionD2336 Guide for Specifying Factory Applied Wood Coat-ings(Withdrawn 2008)3D2793 Test Method for Block Resistance of Organic Coat-ings on Wood Panel SubstratesD2794 Test Method for Resistance of Organic Coatings tothe Effects of Rapid Deformation(Impact)D3023 Practice for Determination of Resistance of Factory-Applied Coatings on Wood Products to Stains and Re-agentsD3281 Test Method for Formability of Attached OrganicCoatings with Impact-Wedge BendApparatus(Withdrawn1995)3D3359 Test Methods for Measuring Adhesion by Tape TestD3363 Test Method for Film Hardness by Pencil Test3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 cure,nthe condition of a coating after conversion tothe final state of cure as measured by tests generally related toend-use performance and mutually agreeable to supplier andpurchaser.3.1.2 ultraviolet curing,nconversion of a coating from itsapplication state to its final use state by means of a mechanisminitiated by ultraviolet radiation generated by equipment de-signed for that purpose.4.Significance and Use4.1 This practice provides a guide whereby all pertinentvariables relating to the ultraviolet cure of a coating aredescribed.5.Procedure5.1 Apply the coating to be cured to the desired substrate ata film thickness typical to that normally used.After approxi-mately the time delay encountered in production pass thecoated substrate through the curing equipment and subse-quently test for cure,as defined in 3.1.1,using the appropriatemethods listed in 5.1.1 through 5.1.11.The most commonlyused test methods are listed in 5.1.1 through 5.1.4.5.1.1 Impact ResistanceTest Method D2794.5.1.2 Film HardnessTest Method D3363.5.1.3 Solvent Rub TestHold a pad of cheesecloth or othercloth saturated with an agreed-upon solvent,usually methylethyl ketone,over two adjacent fingers using a protectivecovering.Rub the wet pad back and forth across a 100-mmportion of the cured film using vigorous pressure,one forwardand one backward movement constituting one double rub.Takethe end point as the number of double rubs required to softenor penetrate the film.Fully cured films are normally required toresist a specified number of rubs and the result of the test isgiven as exceeding the limit or failing the test.1This practice is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.55 on Factory Applied Coatings on Preformed Products.Current edition approved June 1,2011.Published June 2011.Originallyapproved in 1978.Last previous edition approved in 2005 as D3732 82(2005).DOI:10.1520/D3732-82R11.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.1.4 SandabilityUltraviolet cured fillers are usuallyjudged by their sandability with an agreed-upon grit of paper.This test is often made immediately after the material leavesthe ultraviolet processor.5.1.5 Specifying PropertiesGuide D2336.5.1.6 Abrasion ResistanceTest Methods D658 and D968.5.1.7 Indentation HardnessTest Methods D1474.5.1.8 AdhesionTest Methods D2197 and D3359.5.1.9 Block ResistanceTest Method D2793.5.1.10 FormabilityTest Method D3281.5.1.11 Stain and Reagent Resistance Practice D3023.5.2 Repeat the application,curing,and