ASTM_C_675_-_91_2016.pdf

Designation:C67591(Reapproved 2016)Standard Test Method forAlkali Resistance of Ceramic Decorations on ReturnableBeverage Glass Containers1This standard is issued under the fixed designation C675;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 determination of the alkaliresistance of ceramic labels(hereafter referred to as ACL(Applied Color Label)on returnable beverage bottles(hereafterreferred to as ware)to ensure the necessary durability of thelabel.A number of states require the cleaning and sanitizing ofthis ware by washing in hot alkali solutions.Accelerated testsare needed to ensure that the ACL will withstand the antici-pated number of washings and still present an acceptable wareidentification and appearance.1.2 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.Summary of Method2.1 The time required for destruction ofACLon exposure toalkali solutions is roughly proportional to the label thickness.Athin coating of good alkali-resistant enamel will fail in arelatively short time,while an extremely heavy coating of apoor alkali-resistant enamel will look reasonably good.Aqualitative procedure is described.Any plant or laboratoryusing this procedure should establish its own standards.2.1.1 This test method is a qualitative method and deter-mines the time required for 90%destruction of any ACLexposed to an alkali solution by visual inspection.This testmethod requires a minimum of skill and experience by theoperator.3.Significance and Use3.1 This test method provides a means for determining thedurability of decorated returnable glass beverage containerswhich may be a prerequisite in product specifications.4.Interferences4.1 Prepare fresh alkali solution for each set of ware and donot use the solution more than 24 h because of carbon dioxide(CO2)absorption and the inhibiting action of boron compoundsdissolved from the ACL.4.2 Do not use borosilicate glass containers for test solu-tions.5.Apparatus5.1 Tank,steel or stainless steel,equipped with a thermo-statically controlled means of heating,and a solution levelcontrol,to prevent variations in solution concentration andtemperature.The tank should be equipped with a coarsescreenmesh shelf on which ware being tested is placed to avoidsludge build-up around the ware.5.2 Bottle Saw or Hot Wire CutterEither a hot wire or anabrasive wheel saw can be used to cut ware.If an abrasivewheel is used,the abrasive and glass sludge should be rinsedoff the ware to avoid excessive depletion of the alkali solution.6.Reagents6.1 Reagent grade chemicals shall be used in all tests.Unless otherwise indicated,it is intended that all reagents shallconform to the specifications of the Committee on AnalyticalReagents of the American Chemical Society,2where suchspecifications are available.Other grades may be used,pro-vided it is first ascertained that the reagent is of sufficientlyhigh purity to permit its use without lessening the accuracy ofthe determination.6.2 Alkali SolutionPrepare the alkali solution by mixingthe following reagents: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 Oct.1,2016.Published October 2016.Originallyapproved in 1971.Last previous edition approved in 2011 as C675 91(2011).DOI:10.1520/C0675-91R16.2Reagent 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 weight%Sodium hydroxide(NaOH)9.1Trisodium phosphate(Na3PO412H2O)0.9Tap water90.07.Test Specimens7.1 The test ware should be representative of the lot or runand should have good application and fire.Tests should be runon ware with bottoms removed.The bottoms can be easilyremoved with a hot wire cutter or a water-cooled abrasivewheel cut-off saw.It is also convenient to simultaneously cut aring section for fit determination from the same ware.If anabrasive saw is used,the glass and abrasive sludge should berinsed from the ware before testing.8.Procedure8.1 After the alkali solution has reached an equilibriumtemperature of 88 6 1C,place the test ware in the