ASTM_D_1647_-_89_1996e1.pdf

Designation:D 1647 89(Reapproved 1996)e1Standard Test Methods forResistance of Dried Films of Varnishes to Water and Alkali1This standard is issued under the fixed designation D 1647;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(e)indicates an editorial change since the last revision or reapproval.e1NOTEKeywords and the unit measurement statement were added editorially in October 1996.1.Scope1.1 These test methods cover the determination of theresistance of dried varnish films to immersion in water anddilute alkali at room temperature.1.2 The values stated in inch-pound units are to be regardedas the standard.The values given in parentheses are forinformation only.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:D 609 Practice for Preparation of Cold-Rolled Steel Panelsfor Testing Paint,Varnish,Conversion Coatings,andRelated Coating Products2D 1193 Specification for Reagent Water3D 3924 Specification for Standard Environment for Condi-tioning and Testing Paint,Varnish,Lacquers,and RelatedMaterials23.Summary of Test Methods3.1 Test Method AThe material under test is flowed ontotinplate panels and dried for 48 h.The panels are thenimmersed to half their length in reagent water for 18 h,or otheragreed upon time,removed,and examined visually.3.2 Test Method BThe material under test is applied toglass test tubes by dipping and dried for 72 h.The tubes arethen suspended in dilute sodium hydroxide for periods rangingfrom 1 to 24 h,removed,rinsed,and after drying for 30 min,examined visually.4.Significance and Use4.1 Dried Varnish Films are a source of primary protectionfor surfaces.Exposure to water and dilute alkali solutions aretwo factors which tend to break down this protective coating.This test method can be used as a comparison basis betweenmanufacturer and consumer to determine the ability of thevarnish to resist water and dilute alkali.5.Reagents5.1 Purity of ReagentsReagent grade chemicals shall beused in all tests.Unless otherwise indicated,it is intended thatall reagents conform to the specifications of the Committee onAnalytical Reagents of the American Chemical Society,wheresuch specifications are available.45.2 Purity of WaterUnless otherwise indicated,referencesto water shall be understood to mean reagent water as definedby Type IV of Specification D 1193.TEST METHOD AWATER RESISTANCE OF DRIEDFILMS6.Apparatus and Materials6.1 Beaker,glass,600 mL or larger.6.2 Tinplate Panels,3 by 5 in.(75 by 125 mm)cut fromcommercial No.31 gage(0.225-mm)bright tin plate,weighing0.4 to 0.5 lb/ft2(1.90 to 2.50 kg/m2)and carefully cleaned anddried before use in accordance with Methods B or C of PracticeD 609.7.Procedure7.1 Flow the varnish onto the tin panels,allow to drain in anearly vertical position,and dry for 48 h in the standardatmosphere described in Specification D 3924.7.2 Place the panels in a beaker containing about 2.5 in.(65mm)of water at room temperature,immersing the ends thatwere uppermost during drying,and allow to remain in thewater for 18 h,or other suitable period as agreed upon betweenthe purchaser and the seller.7.3 Remove the panels from the water,wipe carefully,andallow to dry at room temperature.Note the time required forwhitening,if any,to disappear.Blooming,which sometimes1These test methods are under the jurisdiction ofASTM Committee D-1 on Paintand Related Coatings,Materials,and Applications and are the direct responsibilityof Subcommittee D01.33 on Polymers and Resins.Current edition approved April 28,1989.Published June 1989.Originallypublished as D 1647 59.Last previous edition D 1647 83.2Annual Book of ASTM Standards,Vol 06.01.3Annual Book of ASTM Standards,Vol 11.01.4Reagent Chemicals,American Chemical Society Specifications,AmericanChemical Society,Washington,DC.For suggestions on the testing of reagents notlisted by the American Chemical Society,see Analar Standards for LaboratoryChemicals,BDH Ltd.,Poole,Dorset,U.K.,and the United States Pharmacopeiaand National Formulary,U.S.Pharmacopeial Convention,Inc.(USPC),Rockville,MD.1AMERICAN SOCIETY FOR TESTING AND MATERIALS100 Barr Harbor Dr.,West Conshohocken,PA 19428Reprinted from the Annual Book of ASTM Standards.Copyright ASTMoccurs on immersion,is considered a type of whitening.8.Report8.1 Report the results of the water test as follows:8.1.1 Not visibly affected,8.1.2 Whitening disappears within 20 min,8.1.3 Whitening does not disappear within 20 min,butdisappears within 2 h,8.1.4 Whitening does not disappear within 2 h,but disap-pears within 24 h,or8.1.5 Whitening does not disappear within