| ||Format||Pages||Price|| |
|7||$52.00||  ADD TO CART|
|Hardcopy (shipping and handling)||7||$52.00||  ADD TO CART|
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 (see NIST SP 260). Until standard reference materials for seals are established by the NIST, secondary reference materials may be agreed upon between manufacturer and purchaser.
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 applicable to determining the degree of mismatch of thermal expansion (or contraction). Tests are in accordance with Test Method , Subsection 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.
1.3 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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
F15 Specification for Iron-Nickel-Cobalt Sealing Alloy
F30 Specification for Iron-Nickel Sealing Alloys
F31 Specification for Nickel-Chromium-Iron Sealing Alloys
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
F256 Specification for Chromium-Iron Sealing Alloys with 18 or 28 Percent Chromium
NIST PublicationsNIST SP260 NIST Special Publications (SP260s)
ICS Number Code 21.140 (Seals, glands)
|Link to Active (This link will always route to the current Active version of the standard.)|
ASTM F140-98(2020), Standard Practice for Making Reference Glass-Metal Butt Seals and Testing for Expansion Characteristics by Polarimetric Methods, ASTM International, West Conshohocken, PA, 2020, www.astm.orgBack to Top