ASTM F14 - 80(2019)

    Standard Practice for Making and Testing Reference Glass-Metal Bead-Seal

    Active Standard ASTM F14 | Developed by Subcommittee: C14.04

    Book of Standards Volume: 15.02


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    Significance and Use

    4.1 The term reference as employed in this practice implies that both the glass and the metal of the reference glass-metal seal will be a standard reference material such as those supplied for other physical tests by the National Institute of Standards and Technology, or a secondary reference material whose sealing characteristics have been determined by seals to a standard reference material (see NIST Special Publication 260).4 Until standard reference materials for seals are established by the NIST, secondary reference materials may be agreed upon between producer and user.5

    1. Scope

    1.1 This practice covers procedures for preparing and testing reference glass-to-metal bead-seals for determining the magnitude of thermal expansion (or contraction) mismatch between the glass and metal. Tests are in accordance with Test Method F218 (see Section 2).

    1.2 This practice applies to all glass-metal combinations, established or experimental, particularly those intended for electronic components.

    1.3 The practical limit of the test in devising mismatch is approximately 300 ppm, above which the glass is likely to fracture.

    1.4 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.

    1.5 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

    F15 Specification for Iron-Nickel-Cobalt Sealing Alloy

    F30 Specification for Iron-Nickel Sealing Alloys

    F31 Specification for Nickel-Chromium-Iron Sealing Alloys

    F79 Specification for Type 101 Sealing Glass

    F105 Specification for Type 58 Borosilicate Sealing Glass

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

    F256 Specification for Chromium-Iron Sealing Alloys with 18 or 28 Percent Chromium

    F257 Specification for Twenty-eight Percent (28 %) Chromium-Iron Alloy for Sealing to Glass


    ICS Code

    ICS Number Code 29.080.20 (Bushings)

    UNSPSC Code

    UNSPSC Code


    Referencing This Standard
    Link Here
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    DOI: 10.1520/F0014-80R19

    Citation Format

    ASTM F14-80(2019), Standard Practice for Making and Testing Reference Glass-Metal Bead-Seal, ASTM International, West Conshohocken, PA, 2019, www.astm.org

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