ASTM_C_1422_-_C_1422M_-_15.pdf

Designation:C1422/C1422M15Standard Specification forChemically Strengthened Flat Glass1This standard is issued under the fixed designation C1422/C1422M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers the requirements for chemi-cally strengthened glass products that are used in generalbuilding construction,transportation,and other applications,such as PC screens,notebooks,tablets,smart phones,andE-readers,as well as copy machine scanners,computer disks,and flat glass screens for television monitors.Techniques suchas ion implantation,dealkalization,etch-strengthening,andglaze coatings are specifically excluded.1.2 Classification of chemically strengthened glass productsis based on the laboratory measurements of surface(depth ofcompression)compression and case depth and not on themodulus of rupture(MOR).This specification does not purportto address end-use performance.1.3 A test method for the measurement of case depth andsurface compression is included in Section 8.1.4 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.5 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:2C162 Terminology of Glass and Glass ProductsC978 Test Method for Photoelastic Determination of Re-sidual Stress in a Transparent Glass Matrix Using aPolarizing Microscope and Optical Retardation Compen-sation ProceduresC1036 Specification for Flat GlassC1279 Test Method for Non-Destructive Photoelastic Mea-surement of Edge and Surface Stresses in Annealed,Heat-Strengthened,and Fully Tempered Flat GlassF218 Test Method for Measuring Optical Retardation andAnalyzing Stress in Glass2.2 ANSI Standard:3Z97.12009 Safety Glazing Materials Used in Buildings-Safety Performance,Specifications and Methods of Tests2.3 Federal Document:4CPSC 16CFR 1201 Consumer Product Safety CommissionSafety Standard for Architectural Glazing Materials3.Terminology3.1 Definitions:3.1.1 Refer to Terminology C162,as appropriate.3.1.2 blemishesRefer to Specification C1036 for flat glass.3.2 Definitions of Terms Specific to This Standard:3.2.1 case depthdepth of compression below the surfaceto the nearest zero stress plane.3.2.2 chemically strengthened glassglass which has beenstrengthened by ion exchange to produce a compressive stresslayer at the treated surface.3.2.3 depth of compression(DOC)-see case depth.3.2.4 ion exchange processthe exchange of constituentions in the glass with externally supplied ions(generally attemperatures near the strain point of the glass).This may beaccomplished by immersing glass in a molten salt bath orsolution with or without electric field,ultrasonic or otherassistance,exposing glass to plasma,applying a paste on theglass surface,or contacting glass with molten salts in a furnace.3.2.5 surface compressionan in-plane stress which tendsto compact the atoms in the surface.1This specification is under the jurisdiction of ASTM Committee C14 on Glassand Glass Products and is the direct responsibility of Subcommittee C14.08 on FlatGlass.Current edition approved Nov.1,2015.Published December 2015.Originallyapproved in 1999.Last previous edition approved in 2010 as C1422/C1422M 10.DOI:10.1520/C1422_C1422M-15.2For 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.4Available from U.S.Consumer Product Safety Commission(CPSC),4330 EastWest Hwy.,Bethesda,MD 20814,http:/www.cpsc.gov.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.Significance and Use4.1 Chemically strengthened glass is significantly strongerthan annealed glass,depending upon the glass composition,strengthening process,level of abrasion,and the applicationenvironment.The strengthening process does not contributesignificantly to optical distortion.4.2 The chemical strengthening process can effectivelystrengthen glass of all sizes and shapes and can be useful incases in which glass is too thin,small,or complex-shaped forthermal tempering.4.3 M