ASTM F 140 Standard Practice for Making Reference Glass-Metal Butt Seals and Testing for Expansion Characteristics by Polarimetric Methods
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ASTM F 140 Document Information:
Title
Standard Practice for Making Reference Glass-Metal Butt Seals and Testing for Expansion Characteristics by Polarimetric Methods
ASTM International
Publication Date:
Oct 10, 1998
Scope:
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
F 218 (Section 1.1).
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.
Keywords:
- expansion mismatch
- glass-metal seals
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