ASTM C1422 / C1422M - 20

    Standard Specification for Chemically Strengthened Flat Glass

    Active Standard ASTM C1422 / C1422M | Developed by Subcommittee: C14.08

    Book of Standards Volume: 15.02


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    1. Scope

    1.1 This specification covers the requirements for chemically strengthened glass products that are used in general building construction, transportation, solar, and other electronic applications, such as PC screens, notebooks, tablets, smart phones, and E-readers, as well as copy machine scanners, computer disks, and flat glass screens for television monitors. The technique covered in this specification usually involves conducting ion exchange of constituent alkali ions in a glass product by immersing it in a bath of molten salt containing larger alkali ions. Penetration of the larger ions into smaller host sites produces a layer of compression on the surface which strengthens the glass. Techniques such as ion implantation, dealkalization, etch-strengthening, and glaze coatings are specifically excluded from this specification.

    1.2 Classification of chemically strengthened glass products is based on the laboratory measurements of surface compression and case depth (depth of compression) and not on the modulus of rupture (MOR). This specification does not purport to address end-use performance.

    1.3 A test method for the measurement of case depth and surface compression is included in Section 8. Another test method for similar measurement using optically guided-wave equipment is included in Section 9.

    1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.

    1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

    1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    C162 Terminology of Glass and Glass Products

    C770 Test Method for Measurement of Glass StressOptical Coefficient

    C978 Test Method for Photoelastic Determination of Residual Stress in a Transparent Glass Matrix Using a Polarizing Microscope and Optical Retardation Compensation Procedures

    C1036 Specification for Flat Glass

    C1279 Test Method for Non-Destructive Photoelastic Measurement of Edge and Surface Stresses in Annealed, Heat-Strengthened, and Fully Tempered Flat Glass

    C1648 Guide for Choosing a Method for Determining the Index of Refraction and Dispersion of Glass

    E1967 Test Method for the Automated Determination of Refractive Index of Glass Samples Using the Oil Immersion Method and a Phase Contrast Microscope

    F218 Test Method for Measuring Optical Retardation and Analyzing Stress in Glass

    ANSI Standard

    Z97.1-2015 Z97.1-2015. Safety Glazing Materials Used In Buildings - Safety Performance Specifications And Methods Of Test

    Federal Document

    CPSC 16CFR 1201 Consumer Product Safety Commission Safety Standard for Architectural Glazing Materials


    ICS Code

    ICS Number Code 81.040.20 (Glass in building)

    UNSPSC Code

    UNSPSC Code 30171700(Glass products)


    Referencing This Standard
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    DOI: 10.1520/C1422_C1422M-20

    Citation Format

    ASTM C1422 / C1422M-20, Standard Specification for Chemically Strengthened Flat Glass, ASTM International, West Conshohocken, PA, 2020, www.astm.org

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