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ASTM F140-98(2013)

(Practice)

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

Standard Practice for<brk type="line"/> Making Reference Glass-Metal Butt Seals 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 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.
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.

General Information

Status
Historical
Publication Date
30-Sep-2013
ICS
21.140 - Seals, glands
Technical Committee
C14 - Glass and Glass Products
Drafting Committee
C14.04 - Physical and Mechanical Properties
Current Stage
Ref Project

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ASTM F140-98(2013) - Standard Practice for<brk type="line"/> Making Reference Glass-Metal Butt Seals and Testing for Expansion Characteristics by Polarimetric MethodsASTM F140-98(2013) - Standard Practice for<brk type="line"/> Making Reference Glass-Metal Butt Seals and Testing for Expansion Characteristics by Polarimetric Methods
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ASTM F140-98(2013) - Standard Practice for<brk type="line"/> Making Reference Glass-Metal Butt Seals and Testing for Expansion Characteristics by Polarimetric Methods
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: F140 − 98 (Reapproved 2013)
Standard Practice for
Making Reference Glass-Metal Butt Seals and Testing for
1
Expansion Characteristics by Polarimetric Methods
ThisstandardisissuedunderthefixeddesignationF140;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope retardation, and the average stress is computed for the sample.
For disk-seals the thermal expansion mismatch is calculated.
1.1 This practice covers the preparation and testing of
reference glass-metal butt seals of two general configurations:
4. Significance and Use
one applicable to determining stress in the glass and the other
4.1 The term “reference” as employed in this practice
to determining the degree of mismatch of thermal expansion
implies that either the glass or the metal of the reference
(or contraction). Tests are in accordance with Test Method
glass-metalsealwillbea“standardreferencematerial”suchas
F218 (Section 1.1).
those supplied for other physical tests by the National Institute
1.2 This practice applies to all glass and metal (or alloy)
forStandardsandTechnology(NIST),orasecondaryreference
combinations normally sealed together in the production of
materialwhosesealingcharacteristicshavebeendeterminedby
4
electronic components. It should not be attempted with glass-
sealstoastandardreferencematerial. Untilstandardreference
metal combinations having widely divergent thermal expan-
materials for seals are established by the NIST, secondary
sion (or contraction) properties.
reference materials may be agreed upon between manufacturer
and purchaser.
2. Referenced Documents
5. Apparatus
2
2.1 ASTM Standards:
5.1 Polarimeter, as specified in Test Method F218 for
F47Test Method for Crystallographic Perfection of Silicon
3
measuring optical retardation and analyzing stress in glass.
by Preferential Etch Techniques (Withdrawn 1998)
F79Specification for Type 101 Sealing Glass
5.2 Cut-Off Saw, with diamond-impregnated wheel and No.
F105Specification for Type 58 Borosilicate Sealing Glass
180 grit abrasive blade under flowing coolant for cutting and
F218Test Method for Measuring Optical Retardation and
fine-grinding glass rod.
Analyzing Stress in Glass
5.3 Glass Polisher, buffing wheel with cerium oxide polish-
ing powder or laboratory-type equipment with fine-grinding
3. Summary of Practice
and polishing laps.
3.1 Five seals of a standard configuration are prepared from
5.4 Heat-Treating and Oxidizing Furnaces, with suitable
representative specimens of the glass and metal to be tested.
controls and with provisions for appropriate atmospheres
The glass and metal are cleaned, treated, and sized to specified
(Annex A1) for preconditioning metal, if required.
proportions. Plane-interfaced seals are formed, annealed, and
measured for residual optical retardation.The stress parallel to 5.5 Sealing Furnace, radiant tube, muffle or r-f induction
the interface in each seal is calculated from the optical
with suitable controls and provision for use with inert atmo-
sphere.
5.6 Annealing Furnace, with capability of controlled cool-
1
This practice is under the jurisdiction ofASTM Committee C14 on Glass and
ing.
Glass Products and is the direct responsibility of Subcommittee C14.04 on Physical
and Mechanical Properties.
5.7 Ultrasonic Cleaner, optional.
Current edition approved Oct. 1, 2013. Published October 2013. Originally
approved in 1971. Last previous edition approved in 2008 as F140–98 (2008).
5.8 Fixture for Furnace Sealing, designed as suggested in
DOI: 10.1520/F0140-98R13.
Annex A2.
2
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
5.9 Micrometer Caliper, with index permitting direct read-
Standards volume information, refer to the standard’s Document Summary page on
ing accuracy of 0.02 cm.
the ASTM website.
3
The last approved version of this historical standard is referenced on
4
www.astm.org. See NIST SP260.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
F140 − 98 (2013)
5.10 Immersion Mercury Thermometer.
6. Materials
6.1 Metal—Representativespecimenpairsofthemetalfrom
either rod or plate stock with dimensions satisfying the
requirements of 7.2 or 7.3.The surfaces to be sealed should be
relatively free of scratches, machine marks, pits, or inclusions
that would induce localized stresses. The sealing surfaces
should terminate in sharp edges at the peripheral corners to act
as a glass stop. Edges that are rounded, such as appear on
tumbl
...

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