ASTM F140 - 98(2013)

    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.4 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 to determining the degree of mismatch of thermal expansion (or contraction). Tests are in accordance with Test Method F218 (Section 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.

    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

    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

    ICS Code

    ICS Number Code 21.140 (Seals, glands)

    UNSPSC Code

    UNSPSC Code

    DOI: 10.1520/F0140

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    ASTM F140

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