ASTM F79-69(2015)

Standard Specification for Type 101 Sealing Glass

ABSTRACT
This specification covers Type 101 sealing glass for use in electronic applications. The glass shall have a finish that ensures smooth, even surfaces and freedom from cracks, checks, bubbles, and other laws of a character detrimental to the strength or life of the component or device for which its use is intended. Different test methods shall be performed in order to determine the following properties of the sealing glass: softening point, annealing point, thermal expansion coefficient, contraction coefficient, and bead seal.
SCOPE
1.1 This specification covers Type 101 sealing glass for use in electronic applications.  
Note 1: This specification is primarily intended to consider glass as most generally used, this is, glass in its transparent form as normally encountered in fabricating electronic devices. X1.3 lists sealing metals and alloys that are compatible with this glass. Type 101 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.

General Information

• Status: Historical
• Publication Date: 30-Apr-2015
• ICS: 21.140 - Seals, glands
• Technical Committee: C14 - Glass and Glass Products
• Drafting Committee: C14.04 - Physical and Mechanical Properties

Relations

• Replaces: ASTM F79-69(2010) - Standard Specification for Type 101 Sealing Glass
• Effective Date: 01-May-2015
• Replaced By: ASTM F79-69(2019) - Standard Specification for Type 101 Sealing Glass
• Effective Date: 01-Nov-2019
• Referred By: ASTM F144-80(2019) - Standard Practice for Making Reference Glass-Metal Sandwich Seal and Testing for Expansion Characteristics by Polarimetric Methods
• Effective Date: 01-May-2015
• Referred By: ASTM F14-80(2019) - Standard Practice for Making and Testing Reference Glass-Metal Bead-Seal
• Effective Date: 01-May-2015
• Referred By: ASTM F140-98(2020) - Standard Practice for Making Reference Glass-Metal Butt Seals and Testing for Expansion Characteristics by Polarimetric Methods
• Effective Date: 01-May-2015

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:F79 −69 (Reapproved 2015)
Standard Specification for
Type 101 Sealing Glass
This standard is issued under the fixed designation F79; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Ordering Information
1.1 This specification covers Type 101 sealing glass for use 3.1 Orders for material under this specification shall include
in electronic applications. the following information:
3.1.1 Form,
NOTE 1—This specification is primarily intended to consider glass as
3.1.2 Type of glass,
most generally used, this is, glass in its transparent form as normally
3.1.3 Dimensions,
encounteredinfabricatingelectronicdevices.X1.3listssealingmetalsand
alloys that are compatible with this glass. Type 101 glass in other forms
3.1.4 Marking and packaging, and
such as powdered, crushed, sintered, fibrous, etc. are excluded. The
3.1.5 Certification (if required).
requirements of this specification, as applied to these forms, must be
established in the raw glass prior to its conversion.
4. Chemical Composition
4.1 The typical chemical composition of this glass is as
2. Referenced Documents
follows (Note 2):
2.1 ASTM Standards:
Major Constituents Weight %
C336 Test Method for Annealing Point and Strain Point of
Glass by Fiber Elongation Silica (SiO ) 56.0
Alumina (Al O)1.5
C338 Test Method for Softening Point of Glass 2 3
Soda (Na O) 4.0
C598 Test Method for Annealing Point and Strain Point of
Potash (K O) 8.5
Glass by Beam Bending
Lead oxide (PbO) 29.0
D150 Test Methods forAC Loss Characteristics and Permit-
Antimony trioxide (Sb O ) 1.0, max
2 3
tivity (Dielectric Constant) of Solid Electrical Insulation
Arsenic trioxide (As O ) 1.0, max
2 3
D257 Test Methods for DC Resistance or Conductance of
Halogens 0.2, max
Insulating Materials
E29 Practice for Using Significant Digits in Test Data to
NOTE 2—Major constituents may be adjusted to give the desired
electricalandphysicalpropertiestotheglass.However,nochangeshallbe
Determine Conformance with Specifications
made that alters any of these properties without due notification of, and
E228 Test Method for Linear Thermal Expansion of Solid
approval by, the user.
Materials With a Push-Rod Dilatometer
F14 Practice for Making and Testing Reference Glass-Metal
5. Physical Properties
Bead-Seal
5.1 The material shall conform to the physical properties
F140 Practice for Making Reference Glass-Metal Butt Seals
prescribed in Table 1. For electrical properties see Table 2 and
and Testing for Expansion Characteristics by Polarimetric
its Footnote A.
Methods
F144 Practice for Making Reference Glass-Metal Sandwich
6. Workmanship, Finish, and Appearance
Seal and Testing for Expansion Characteristics by Polari-
6.1 The glass shall have a finish that ensures smooth, even
metric Methods
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.
This specification is under the jurisdiction of ASTM Committee C14 on Glass
and Glass Products and is the direct responsibility of Subcommittee C14.04 on
7. Test Methods
Physical and Mechanical Properties.
Current edition approved May 1, 2015. Published May 2015. Originally 7.1 Softening Point—See Test Method C338.
approved in 1967. Last previous edition approved in 2010 as F79 – 69 (2010). DOI:
7.2 Annealing Point—See Test Methods C336 or C598.
10.1520/F0079-69R15.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
7.3 Thermal Expansion Coeffıcient—Pretreat the specimen
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
by heating to 10°C above the annealing point and hold it at that
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. temperature for 15 min; then cool it from that temperature to
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F79−69 (2015)
TABLE 1 Physical Requirements
A A
Property ASTM Test Method Condition Value
Softening point C338 sec 7.1 630 ± 10°C
Annealing point C336 or C598 sec 7.2 435 ± 10°C
Thermal expansion coefficient E228 sec 7.3 8.95 ± 0.20 ppm/°C
0 to 300°C
Contraction coefficient E228 sec 7.4 10.10 ± 0.20 ppm/°C
(annealing point minus
15 to 30°C)
A
Test methods and conditions are detailed in the appropriately referenced section of this specification.
A
TABLE 2 Electrical Properties
7.5 Bead Seal Test—Thethermalcontractionmatchbetween
ASTM Test
the glass and a sealing alloy may be determined by preparing
Property Condition Value (Typical)
Method
and testing an assembly in accordance with Practices F14,
B
Volume resistivity (dc) D257 25°C log R (Ω·cm) 17.0
F140,or F144.
250°C log R (Ω·cm) 9.9
350°C log R (Ω·cm) 7.8
8. Test Results
B
Dielectric constant (1 MHz) D150 20°C 6.7
8.1 Observed or calculated values obtained from
Dissipation factor (1 MHz) D150 20°C 0.0014
measurements,tests,oranalysisshallberoundedinaccordance
Loss index
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: F79 − 69 (Reapproved 2010) F79 − 69 (Reapproved 2015)
Standard Specification for
Type 101 Sealing Glass
This standard is issued under the fixed designation F79; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This specification covers Type 101 sealing glass for use in electronic applications.
NOTE 1—This specification is primarily intended to consider glass as most generally used, this is, glass in its transparent form as normally encountered
in fabricating electronic devices. X1.3 lists sealing metals and alloys that are compatible with this glass. Type 101 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
2.1 ASTM Standards:
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
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
3. Ordering Information
3.1 Orders for material under this specification shall include the following information:
3.1.1 Form,
3.1.2 Type of glass,
3.1.3 Dimensions,
3.1.4 Marking and packaging, and
3.1.5 Certification (if required).
4. Chemical Composition
4.1 The typical chemical composition of this glass is as follows (Note 2):
Major Constituents Weight %
Silica (SiO ) 56.0
Alumina (Al O ) 1.5
2 3
Soda (Na O) 4.0
Potash (K O) 8.5
Lead oxide (PbO) 29.0
Antimony trioxide (Sb O ) 1.0, max
2 3
This specification is under the jurisdiction of ASTM Committee C14 on Glass and Glass Products and is the direct responsibility of Subcommittee C14.04 on Physical
and Mechanical Properties.
Current edition approved Oct. 1, 2010May 1, 2015. Published October 2010May 2015. Originally approved in 1967. Last previous edition approved in 20052010 as
F79 – 69 (2010). (2005). DOI: 10.1520/F0079-69R10.10.1520/F0079-69R15.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F79 − 69 (2015)
Arsenic trioxide (As O ) 1.0, max
2 3
Halogens 0.2, max
NOTE 2—Major constituents may be adjusted to give the desired electrical and physical properties to the glass. However, no change shall be made that
alters any of these properties without due notification of, and approval by, the user.
5. Physical Properties
5.1 The material shall conform to the physical properties prescribed in Table 1. For electrical properties see Table 2 and its
Footnote A.
6. Workmanship, Finish, and Appearance
6.1 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.
7. Test Methods
7.1 Softening Point—See Test Method C338.
7.2 Annealing Point—See Test MethodMethods C336 or Test Method C598.
7.3 Thermal Expansion Coeffıcient—Pretreat the specimen by heating to 10°C above the annealing point and hold it at that
temperature for 15 min; then cool it from that temperature to 100°C at a rate of 2 to 5°C/min. The cooling rate below 100°C is
optional. Place the specimen in the dilatometer and determine the mean coefficient of linear thermal expansion for the 0 to 300°C
range in accordance with Procedure A of Test Method E228.
7.4 Contraction Coeffıcient—Heat the specimen in a vitreous silica dilatometer to 20°C above the annealing point and hold it
at that temperature for 15 min; then cool at a rate of from 1.0 to 1.5°C/min to a temperature below 200°C. The rate of cooling from
the point below 200 to 100°C shall not exceed 5°C/min. The rate of cooling from 100°C to room temperature is optional. During
this cooling schedule, determine the thermal contraction curve and calculate the mean coefficient of linear thermal contraction
between a point 15°C below the annealing point and 30°C in accordance with Procedure B of Test Method E228.
7.5 Bead Seal Test—The thermal contraction match between the glass and a sealing alloy may be determined by pr
...