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ASTM F140-98(2013)
Standard Practice for Making Reference Glass-Metal Butt Seals and Testing for Expansion Characteristics by Polarimetric Methods
6 стр.
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Разработчик:
Зарубежные/ASTM
ICS:
21.140 Seals, glands / Уплотнения, сальники
Сборник (ASTM):
15.02 Glass; Ceramic Whitewares / Стекло, Фарфорофаянсовые керамические изделия
Тематика:
Glass, Ceramics
Описание
Значение и использование

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.

Область применения

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.

Ключевые слова:
expansion mismatch; glass-metal seals