ASTM_C_1203_-_04_2014.pdf

Designation:C120304(Reapproved 2014)Standard Test Method forQuantitative Determination of Alkali Resistance of aCeramic-Glass Enamel1This standard is issued under the fixed designation C1203;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 This test method covers the determination of the resis-tance of a fired ceramic-glass enamel to a 10%alkali solutionheld near its boiling point for 2 h.1.2 This test method is not applicable to large temperedglass sheets or specimens larger than 9 by 9 cm.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.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.For specific hazardstatements,see Section 9.2.Referenced Documents2.1 ASTM Standards:2C162 Terminology of Glass and Glass ProductsC927 Test Method for Lead and Cadmium Extracted fromthe Lip and Rim Area of Glass Tumblers ExternallyDecorated with Ceramic Glass EnamelsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Terminology3.1 Definitions:3.1.1 For additional definitions of terms refer to Terminol-ogy C162.3.1.2 ceramic glass enamels(also glass enamels or ceramicenamels)predominantly colored,silicate-glass fluxes used todecorate glassware.C9273.1.3 maturityof a fired ceramic glass enamel,a ceramicglass enamel has been fired to maturity when porosity of theceramic glass enamel has been substantially eliminated,andthe expected surface gloss of the fired ceramic glass enamel hasbeen achieved.3.1.3.1 DiscussionRefer to GTA Engineering StandardsManual,Section 4,D.3.3.1 and D.3.4.1,for testing criteria formaturity.34.Summary of Test Method4.1 This test method measures the weight loss of a glassspecimen decorated with a fired ceramic-glass enamel,whencompletely immersed in a 10%alkali solution near its boilingpoint.A stainless steel beaker containing test samples and a10%alkali solution is heated at 95C in a temperaturecontrolled water bath for 2 h.Chemical dissolution of theceramic-glass-enamel coating as well as any loss of weight dueto the dissolution of the substrate is measured by determiningweight loss of the specimen after exposure to the hot alkalisolution.A substrate without ceramic-glass enamel is tested todetermine the expected weight loss due to dissolution of thenondecorated side of the substrate.5.Significance and Use5.1 This test method is intended to be used when a quanti-tative measurement of the alkali durability of a ceramic-glassenamel is needed.The test is applicable to glass coated withfired enamels where exposure to strong alkalis,or alkalis atelevated temperatures might be encountered in service.5.2 This test method is intended to be an accelerated,destructive test.Results can be used as an indicator of therelative durability of a particular enamel.6.Interferences6.1 The extent to which an enamel has been fired tomaturity,as well as the residual stresses remaining afterannealing of test specimen,can influence results.1This test method is under the jurisdiction of ASTM Committee C14 on Glassand Glass Products and is the direct responsibility of Subcommittee C14.10 onGlass Decoration.Current edition approved May 1,2014.Published May 2014.Originallyapproved in 1991.Last previous edition approved in 2009 as C1203 04(2009).DOI:10.1520/C1203-04R14.2For 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.3GTA Engineering Standards Manual,Glass Tempering Association,Topeka,KS,1992.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.2 Tests performed on tempered or heat-strengthened pro-duction ware should be done by annealing the chosen sheetbefore cutting the specimen.7.Apparatus7.1 Balance or Scale,accurate to 0.1 g,to weigh reagents.7.2 Balance,accurate to 0.1 mg,to weigh specimens.7.3 Waterbath,temperature controlled,capable of holding95 6 3C.7.4 Glass Marking Scribe.7.5 Beaker,stainless steel,1200-mL,with no pouring lip,asshown in Fig.1.7.6 Cover,stainless steel,for beaker.7.7 Sample Holder,as shown in Fig.1.7.8 Tongs,heavy duty.7.9 Rubber Gloves,chemically resistant.7.10 Apron or Lab Coat,chemically resistant.7.11 Face Shield.7.12 Fume Hood,for ventilation.7.13 Cloth,soft cotton.7.14 Caliper,micrometer,accurate to 0.1 mm.7.15 Oven,drying,capable of heating samples at 65 6 5C.8