ASTM_D_5895_-_13.pdf

Designation:D589513Standard Test Methods forEvaluating Drying or Curing During Film Formation ofOrganic Coatings Using Mechanical Recorders1This standard is issued under the fixed designation D5895;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.1.Scope1.1 These test methods describe the determination of severalstages and the rate of dry-film formation of organic coatingsusing straight line and circular mechanical drying-time record-ing devices.The use of mechanical recorders is valuable incomparing the drying behavior of coatings of the same generictype,allowing that one coating may form a gel or resist tearingat a faster rate than another.1.2 Drying time measured using the mechanical recordersmay differ from those found using conventional methods,suchas Test Method D1640 or ISO 9117-3(formerly ISO 1517).1.3 The values stated in SI are to be regarded as thestandard.The values given in parentheses are provided forinformation only.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:2D823 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 MicrometersD1640 Test Methods for Drying,Curing,or Film Formationof Organic Coatings at Room TemperatureD3924 Specification for Environment for Conditioning andTesting Paint,Varnish,Lacquer,and Related MaterialsD3925 Practice for Sampling Liquid Paints and RelatedPigmented Coatings2.2 ISO Standard:ISO 9117-3 Drying testsSurfacedrying test using ballo-tini33.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 dry-hard time,nthe dry-hard condition is reachedusing mechanical recorders when the drying and curing,orboth,reactions have proceeded sufficiently that the film is notdisplaced nor is any noticeable mark left by pinching the panelsbetween the thumb on the film and forefinger with a relativelystrong force.3.1.1.1 DiscussionIn these test methods,the dry-hard timeis reached where the stylus has risen out of the film and rideson the surface,leaving only a mark without disrupting the bodyof the film(see Fig.1 and Fig.2).3.1.2 dry-through time,nthe dry-through condition isreached when the film has solidified so completely that a large,twisting force can be applied without distorting the film.3.1.2.1 DiscussionIn these test methods,the dry-throughtime is reached when the stylus no longer left any visible markon the film(see Fig.1 and Fig.2).3.1.3 set-to-touch time,nThe set-to-touch condition isreached when the film has solidified sufficiently,by solventevaporation or chemical reaction,or both,that it not longerflows nor sticks to a finger that lightly touches it.3.1.3.1 DiscussionIn these test methods,the set-to-touchtime is reached where a pear-shaped depression appears in thefilm when the film stops flowing over the path of the recordersstylus and leaves a track in the film revealing the glasssubstrate(see Fig.1 and Fig.2).3.1.4 tack-free time,nthe tack-free condition is reachedusing mechanical recorders when the film surface has dried orcured(see set-to-touch time)so that the film does not adhere tovery light objects placed on it.3.1.4.1 DiscussionIn these test methods,the tack-freetime is reached where the continuous track in the film ceases1These 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 1,2013.Published June 2013.Originallyapproved in 1996.Last previous edition approved in 2008 as D5895 03(2008).DOI:10.1520/D5895-13.2For 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 States1 and the stylus starts to tear the film or leave a ragged/sharp-edged grove as it first begins to climb over the film(see Fig.1and Fig.2).NOTE1The above descriptions are typical for coatings that do notskin over during curing.Any coating which exhibits skinning,such as twopack epoxies or polyurethane coatings,will show a very different trackwhere th