ASTM F140 - 98(2020)

    Standard Practice for Making Reference Glass-Metal Butt Seals and Testing for Expansion Characteristics by Polarimetric Methods

    Active Standard ASTM F140 | 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 either the glass or 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 for Standards and Technology (NIST), or a secondary reference material whose sealing characteristics have been determined by seals to a standard reference material (see NIST SP 260). Until standard reference materials for seals are established by the NIST, secondary reference materials may be agreed upon between manufacturer and purchaser.

    1. Scope

    1.1 This practice covers the preparation and testing of reference glass-metal butt seals of two general configurations, one applicable to determining stress in the glass and the other applicable to determining the degree of mismatch of thermal expansion (or contraction). Tests are in accordance with Test Method F218, Subsection 1.1.

    1.2 This practice applies to all glass and metal (or alloy) combinations normally sealed together in the production of electronic components. It should not be attempted with glass-metal combinations having widely divergent thermal expansion (or contraction) properties.

    1.3 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

    F47 Test Method for Crystallographic Perfection of Silicon by Preferential Etch Techniques

    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

    NIST Publications

    NIST SP260 NIST Special Publications (SP260s)


    ICS Code

    ICS Number Code 21.140 (Seals, glands)

    UNSPSC Code

    UNSPSC Code


    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/F0140-98R20

    Citation Format

    ASTM F140-98(2020), Standard Practice for Making Reference Glass-Metal Butt Seals and Testing for Expansion Characteristics by Polarimetric Methods, ASTM International, West Conshohocken, PA, 2020, www.astm.org

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