ASTM F2248 - 19

    Standard Practice for Specifying an Equivalent 3-Second Duration Design Loading for Blast Resistant Glazing Fabricated with Laminated Glass

    Active Standard ASTM F2248 | Developed by Subcommittee: F12.10

    Book of Standards Volume: 15.08


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    Significance and Use

    5.1 This practice provides a design load suitable for sizing blast resistant glazing comprised of laminated glass or insulating glass fabricated with laminated glass.

    5.2 Blast resistant glazing comprised of laminated glass or insulating glass fabricated with laminated glass shall be sized to resist the 3-second duration equivalent design loading from this standard practice using the procedures described in Practice E1300.

    5.3 In the event a blast loading does not occur to blast resistant glazing comprised of laminated glass or insulating glass fabricated with laminated glass sized using the 3-second duration loading determined herein, the blast resistant glazing will have a probability of breakage less than or equal to 8 lites per 1000 at the first occurrence of a loading equal to the 3-second duration design loading determined herein.

    5.4 Blast resistant glazing designed to resist the 3-second equivalent load as determined herein, when properly supported as part of a blast resistant glazing system, is designed to perform to minimal hazard as defined in Test Method F2912.

    1. Scope

    1.1 This practice sets forth a method to specify an equivalent 3-second design loading suitable to use with Practice E1300 to select the thickness and type of blast resistant glazing fabricated with laminated glass to glaze a fenestration. Glass plies used to construct laminated glass are recommended to be either annealed or heat strengthened glass. This analytical method for glazing should be used with caution for glazing panels larger than 1.8 m by 2.4 m (6 ft by 8 ft) as this size panel exceeds database of testing upon which this standard is based.

    1.2 This practice applies to blast resistant glazing fabricated using laminated glass only, including single laminated glass and insulating glass fabricated with laminated glass. As a minimum, insulating glass shall use laminated glass for the inboard (protected side) lite.

    1.3 This practice assumes that blast resistant glazing shall be attached to its supporting frame using a captured bite so that it does not detach in the event of fracture due to a blast event.

    1.4 Blast resistant glazing designed using this practice recommends the use of annealed or heat strengthened glass plies for the laminated glass. Blast testing has shown that use of fully tempered glass plies, when fractured during a blast event, have poorer post blast performance than annealed or heat strengthened glass plies. Laminated glass fabricated with fully tempered glass plies has a tendency to leave the supporting glazing system frame after fracture whereas laminated glass fabricated with annealed or heat strengthened glass plies will remain in the frame and absorb remaining load through tensile membrane behavior. Use of the annealed or heat strengthened glass plies will also reduce the amount of load transferred into the structure.

    1.5 The equivalent 3-second design load as determined herein shall not apply to the design of monolithic glazing, plastic glazing, or security film applied to existing glazing configurations in an attempt to achieve blast resistance.

    1.6 The values stated in SI units are to be regarded as the standard. Values given in parentheses are for information only. For conversion of quantities in various systems of measurements to SI units refer to ANSI IEEE/SI 10.

    1.7 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.

    1.8 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.

    ANSI Standard

    IEEE/SI10 Use of the International System of Units (SI): (The Modernized Metric System)

    ASTM Standards

    C1036 Specification for Flat Glass

    C1048 Specification for Heat-Strengthened and Fully Tempered Flat Glass

    C1172 Specification for Laminated Architectural Flat Glass

    C1422/C1422M Specification for Chemically Strengthened Flat Glass

    C1564 Guide for Use of Silicone Sealants for Protective Glazing Systems

    E631 Terminology of Building Constructions

    E1300 Practice for Determining Load Resistance of Glass in Buildings

    F1642/F1642M Test Method for Glazing and Glazing Systems Subject to Airblast Loadings

    F2912 Specification for Glazing and Glazing Systems Subject to Airblast Loadings


    ICS Code

    ICS Number Code 81.040.30 (Glass products)

    UNSPSC Code

    UNSPSC Code 30171705(Laminated glass)


    Referencing This Standard
    Link Here
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    DOI: 10.1520/F2248-19

    Citation Format

    ASTM F2248-19, Standard Practice for Specifying an Equivalent 3-Second Duration Design Loading for Blast Resistant Glazing Fabricated with Laminated Glass, ASTM International, West Conshohocken, PA, 2019, www.astm.org

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