ASTM F144-80(2019)
(Practice)Standard Practice for Making Reference Glass-Metal Sandwich Seal and Testing for Expansion Characteristics by Polarimetric Methods
Standard Practice for Making Reference Glass-Metal Sandwich Seal and Testing for Expansion Characteristics by Polarimetric Methods
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 of Standards and Technology, or a secondary reference material whose sealing characteristics have been determined by seals to a standard reference material (see NBS Special Publication 260). Until standard reference materials for seals are established by the NIST, secondary reference materials may be agreed upon between manufacturer and purchaser.
SCOPE
1.1 This practice covers the preparation and testing of a reference glass-metal sandwich seal for determining stress in the glass or for determining the degree of thermal expansion (or contraction) mismatch between the glass and metal. Tests are in accordance with Test Method F218 (Section 2).
1.2 This practice applies to all glass and metal (or alloy) combinations normally sealed together in the production of electronic components.
1.3 The practical limit of the test in deriving 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.
General Information
Relations
Standards Content (Sample)
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.
Designation: F144 −80 (Reapproved 2019)
Standard Practice for
Making Reference Glass-Metal Sandwich Seal and Testing
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for Expansion Characteristics by Polarimetric Methods
ThisstandardisissuedunderthefixeddesignationF144;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
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1. Scope by Preferential Etch Techniques (Withdrawn 1998)
F79 Specification for Type 101 Sealing Glass
1.1 This practice covers the preparation and testing of a
F105 Specification for Type 58 Borosilicate Sealing Glass
reference glass-metal sandwich seal for determining stress in
F218 Test Method for Measuring Optical Retardation and
the glass or for determining the degree of thermal expansion
Analyzing Stress in Glass
(or contraction) mismatch between the glass and metal. Tests
F256 Specification for Chromium-Iron Sealing Alloys with
are in accordance with Test Method F218 (Section 2).
18 or 28 Percent Chromium
1.2 This practice applies to all glass and metal (or alloy)
3. Summary of Practice
combinations normally sealed together in the production of
electronic components.
3.1 Seals of a standard configuration are prepared from
representative specimens of the glass and metal to be tested.
1.3 The practical limit of the test in deriving mismatch is
The glass and metal are cleaned, treated, and sized to specified
approximately 300 ppm, above which the glass is likely to
proportions. Plane-interfaced seals are formed, annealed, and
fracture.
measured for residual optical retardation. The stress parallel to
1.4 This standard does not purport to address all of the
the interface in each seal is calculated from the optical
safety concerns, if any, associated with its use. It is the
retardation, and the average stress and thermal expansion
responsibility of the user of this standard to establish appro-
mismatch are computed for the sample.
priate safety, health, and environmental practices and deter-
4. Significance and Use
mine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accor-
4.1 The term “reference” as employed in this practice
dance with internationally recognized principles on standard-
implies that either the glass or the metal of the reference
ization established in the Decision on Principles for the
glass-metal seal will be a “standard reference material” such as
Development of International Standards, Guides and Recom-
those supplied for other physical tests by the National Institute
mendations issued by the World Trade Organization Technical
ofStandardsandTechnology,orasecondaryreferencematerial
Barriers to Trade (TBT) Committee.
whose sealing characteristics have been determined by seals to
a standard reference material (see NBS Special Publication
2. Referenced Documents
260). Until standard reference materials for seals are estab-
2 lished by the NIST, secondary reference materials may be
2.1 ASTM Standards:
agreed upon between manufacturer and purchaser.
F15 Specification for Iron-Nickel-Cobalt Sealing Alloy
F30 Specification for Iron-Nickel Sealing Alloys
5. Apparatus
F31 Specification for Nickel-Chromium-Iron SealingAlloys
5.1 Polarimeter, as specified in Test Method F218 for
F47 Test Method for Crystallographic Perfection of Silicon
measuring optical retardation and analyzing stress in glass.
5.2 Cut-Off Saw, with diamond-impregnated wheel and No.
180 grit abrasive blade under flowing coolant for cutting and
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This practice is under the jurisdiction of ASTM Committee C14 on Glass and
fine-grinding glass rod.
Glass Products and is the direct responsibility of Subcommittee C14.04 on Physical
and Mechanical Properties.
5.3 Glass Polisher, buffing wheel with cerium oxide polish-
Current edition approved Nov. 1, 2019. Published November 2019. Originally
ing powder or laboratory-type equipment with fine-grinding
approved in 1971. Last previous edition approved in 2015 as F144 – 80 (2015).
DOI: 10.1520/F0144-80R19.
and polishing laps.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
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Standards volume information, refer to the standard’s Document Summary page on The last approved version of this historical standard is referenced on
the ASTM website. www.astm.org.
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