ASTM F79-69(R2019) pdf free download

ASTM F79-69(R2019) pdf free download.Standard Specification for Type 101 Sealing Glass
1. Scope
1.1 This specification covers Type 101 sealing glass for use in electronic applications. N OTE 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. 1.2 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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).N OTE 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 Methods C336 or 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 vitre- ous 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 ofcooling from the point below 200 to 100 °C shall not exceed 5 °C/min. The rate ofcooling from 100 °C to room temperature is optional. During this cooling schedule, determine the ther- mal 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 preparing and testing an assembly in accordance with Practices F14, F140, or F144.
8. Test Results
8.1 Observed or calculated values obtained from measurements, tests, or analysis shall be rounded in accordance with the rounding method of Practice E29, to the nearest unit in the last right-hand place of figures used in expressing the specified limit.
9. Investigation of Claims
9.1 Where any material fails to meet the requirements of this specification, the material so designated shall be handled in accordance with the agreement mutually acceptable to the manufacturer and the purchaser.
10. Packaging and Package Marking
10.1 Packing shall be determined by the form in which this material shall be supplied and shall be subject to agreement between the manufacturer and the purchaser. 10.2 The material as furnished under this specification shall be identified by the name or symbol of the manufacturer. The lot size for determining compliance with the requirements of this specification shall be one day’s production.