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This specification covers type 58 borosilicate sealing glass for use in electronic applications. The glass material shall conform to the chemical composition requirements prescribed. The material shall conform to the physical and electrical properties prescribed. The glass shall have a finish that ensures smooth, even surfaces and freedom from cracks, checks, bubbles, and other flaws of a character detrimental to the strength or life of the component or device for which its use is intended. The softening point and annealing point shall be tested to meet the requirements prescribed. The thermal expansion coefficient of the glass material shall be determined using the required procedure. The contracting coefficient of the glass material shall be tested to meet the requirements prescribed. The thermal contraction match between the glass and a sealing alloy may be determined by preparing and testing an assembly to meet the requirements prescribed.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
Significance and Use
1.1 This specification covers Type 58 borosilicate sealing glass for use in electronic applications.
Note 1—This specification is primarily intended to consider glass as most generally used, that is, glass in its transparent form as normally encountered in fabricating electronic devices. X1.3 refers to a sealing alloy that is compatible with this glass. Type 58 glass in other forms such as powdered, crushed, sintered, fibrous, etc., are excluded. The requirements of this specification, as applied to these forms, must be established in the raw glass prior to its conversion.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
C336 Test Method for Annealing Point and Strain Point of Glass by Fiber Elongation
C338 Test Method for Softening Point of Glass
C598 Test Method for Annealing Point and Strain Point of Glass by Beam Bending
D150 Test Methods for AC Loss Characteristics and Permittivity (Dielectric Constant) of Solid Electrical Insulation
D257 Test Methods for DC Resistance or Conductance of Insulating Materials
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E228 Test Method for Linear Thermal Expansion of Solid Materials With a Push-Rod Dilatometer
F14 Practice for Making and Testing Reference Glass-Metal Bead-Seal
F15 Specification for Iron-Nickel-Cobalt Sealing Alloy
F140 Practice for Making Reference Glass-Metal Butt Seals and Testing for Expansion Characteristics by Polarimetric Methods
F144 Practice for Making Reference Glass-Metal Sandwich Seal and Testing for Expansion Characteristics by Polarimetric Methods
ICS Number Code 21.140 (Seals, glands)