ASTM F204-76(2018)
(Test Method)Standard Test Method for Surface Flaws in Tungsten Seal Rod and Wire
Standard Test Method for Surface Flaws in Tungsten Seal Rod and Wire
ABSTRACT
This test method establishes the apparatuses to be used, specimen preparation methods, and standard procedures for determining the presence of surface flaws in tungsten-seal rods and wires of random or cut lengths, and in the tungsten section of multiple-piece-through leads used in electronic devices, by means of examination of a glass bead sealed to the tungsten.
SCOPE
1.1 This test method covers the determination of the presence of surface flaws in tungsten-seal rod and wire of random or cut lengths, and in the tungsten section of multiple-piece-through leads used in electronic devices, by means of examination of a glass bead sealed to the tungsten.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 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.
General Information
- Status
- Published
- Publication Date
- 28-Feb-2018
- Technical Committee
- F01 - Electronics
- Drafting Committee
- F01.03 - Metallic Materials, Wire Bonding, and Flip Chip
Relations
- Effective Date
- 01-Mar-2018
- Referred By
ASTM F288-96(2019) - Standard Specification for Tungsten Wire for Electron Devices and Lamps - Effective Date
- 01-Mar-2018
Overview
ASTM F204-76(2018), titled Standard Test Method for Surface Flaws in Tungsten Seal Rod and Wire, establishes a standardized procedure for detecting surface flaws in tungsten-seal rods and wires of random or cut lengths, as well as in the tungsten sections of multiple-piece-through leads used in electronic devices. This method relies on the examination of a glass bead sealed to the tungsten surface, enabling identification of fissures, faults, or lines of bubbles that may impact the integrity of glass-to-tungsten seals. The standard, developed by ASTM, is recognized internationally and adheres to global principles for the development of technical standards.
Key Topics
- Surface Flaw Detection: The method is optimized for finding surface flaws-such as fissures and specific bubble formations-in tungsten rods and wires, particularly those used for electronic component assembly.
- Glass-to-Tungsten Seal Inspection: By forming a glass bead seal on the tungsten, the standard allows for effective observation of flaws at the metal-glass interface.
- Specimen Preparation: Clear procedures are provided for cleaning and preparing tungsten specimens to ensure consistent and reliable results, with alternative cleaning methods detailed for resolving disputes between manufacturers and purchasers.
- Apparatus and Equipment: Requirements include specialized beading equipment, low-power microscopes (up to 30x magnification), and diffuse white lighting to ensure proper evaluation of the bead-tungsten interface.
- Reporting Requirements: Specific data points must be recorded, such as the cleaning procedure, number of specimens, microscopy magnification, glass bead type, and the number of faults observed.
Applications
The ASTM F204-76(2018) standard is widely applied in:
- Electronics Manufacturing: The method is crucial in quality control processes involving glass-to-metal seals in electronic devices, such as vacuum tubes, diodes, and hermetically sealed relays.
- Component Inspection: Used by manufacturers and quality control laboratories to ensure tungsten rod and wire sections are free of surface flaws that could compromise device reliability.
- Lead Assembly Verification: Essential for verifying the integrity of multiple-piece-through leads in microelectronic assemblies, ensuring electrical insulation and structural stability.
The standard supports manufacturers in maintaining high standards of product reliability and performance through detailed, repeatable flaw detection protocols. Its use of SI units ensures consistency and comparability of results internationally.
Related Standards
Professionals working with ASTM F204-76(2018) may also reference these related standards:
- ASTM F15: Standard Specification for Glasses for Use in Sealing to Metals and Alloys for Electronic Components
- ASTM F1467: Standard Specification for Sintered Tungsten for Electronic Applications
- ASTM F1400: Standard Guide for Selecting Glass-to-Metal Seals for Electronic Applications
These companion standards provide guidance on materials selection, specification, and additional testing methods, complementing the procedures outlined in ASTM F204-76(2018) for comprehensive quality assurance in glass-to-metal seals and tungsten component production.
Keywords: surface flaws, tungsten seal rod and wire, glass bead seal, glass-to-metal seals, electronic device testing, ASTM F204-76(2018), tungsten-glass interface, quality control, flaw detection, microelectronic assembly
Frequently Asked Questions
ASTM F204-76(2018) is a standard published by ASTM International. Its full title is "Standard Test Method for Surface Flaws in Tungsten Seal Rod and Wire". This standard covers: ABSTRACT This test method establishes the apparatuses to be used, specimen preparation methods, and standard procedures for determining the presence of surface flaws in tungsten-seal rods and wires of random or cut lengths, and in the tungsten section of multiple-piece-through leads used in electronic devices, by means of examination of a glass bead sealed to the tungsten. SCOPE 1.1 This test method covers the determination of the presence of surface flaws in tungsten-seal rod and wire of random or cut lengths, and in the tungsten section of multiple-piece-through leads used in electronic devices, by means of examination of a glass bead sealed to the tungsten. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 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.
ABSTRACT This test method establishes the apparatuses to be used, specimen preparation methods, and standard procedures for determining the presence of surface flaws in tungsten-seal rods and wires of random or cut lengths, and in the tungsten section of multiple-piece-through leads used in electronic devices, by means of examination of a glass bead sealed to the tungsten. SCOPE 1.1 This test method covers the determination of the presence of surface flaws in tungsten-seal rod and wire of random or cut lengths, and in the tungsten section of multiple-piece-through leads used in electronic devices, by means of examination of a glass bead sealed to the tungsten. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 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.
ASTM F204-76(2018) is classified under the following ICS (International Classification for Standards) categories: 21.140 - Seals, glands. The ICS classification helps identify the subject area and facilitates finding related standards.
ASTM F204-76(2018) has the following relationships with other standards: It is inter standard links to ASTM F204-76(2013), ASTM F288-96(2019). Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ASTM F204-76(2018) is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
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.
Designation: F204 − 76 (Reapproved 2018)
Standard Test Method for
Surface Flaws in Tungsten Seal Rod and Wire
ThisstandardisissuedunderthefixeddesignationF204;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
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. Apparatus
1.1 This test method covers the determination of the pres- 3.1 Beading Equipment—Suitable beading equipment ca-
ence of surface flaws in tungsten-seal rod and wire of random pable of producing glass-to-tungsten seals as prescribed in
or cut lengths, and in the tungsten section of multiple-piece- Section 4.
through leads used in electronic devices, by means of exami-
3.2 Microscope—Alow-power microscope capable of mag-
nation of a glass bead sealed to the tungsten.
nification up to 30 diameters, preferably of the binocular type.
1.2 The values stated in SI units are to be regarded as
3.3 Light Source— A suitable white light source, preferably
standard. No other units of measurement are included in this
diffuse for illumination of the bead under the microscope.
standard.
4. Preparation of Test Specimen
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the 4.1 The test specimen shall be a beaded tungsten rod
responsibility of the user of this standard to establish appro-
prepared in the following manner:
priate safety, health, and environmental practices and deter- 4.1.1 Clean the surface to be beaded in the usual manner
mine the applicability of regulatory limitations prior to use.
employed by the user of the tungsten.
1.4 This international standard was developed in accor- 4.1.2 Alternative Methods of Specimen Preparation—In
dance with internationally recognized principles on standard-
case of disagreement between the manufacturer and the
ization established in the Decision on Principles for the purchaser, substitute one of the following alternative methods
Development of International Standards, Guides and Recom-
of preparing the tungsten rod for that in 4.1.1.
mendations issued by the World Trade Organization Technical 4.1.2.1 Boilthetungstenfor2minina5 %solutionof27 %
Barriers to Trade (TBT) Committee. hydrogen peroxide. Pour off the hydrogen peroxide and rinse
the tungsten twice in distilled water. Dry rapidly with pure
2. Terminology alcohol or in an oven heated to 100°C.
4.1.2.2 Place the tungsten in a solution (20 weight %) of
2.1 Definitions:
sodium hydroxide or potassium hydroxide and pass sufficient
2.1.1 beaded length—the actual length through which a
electrical current through it to induce electrolytic action
glass-to-tungsten seal exists as evidenced by the color of the
sufficient to clean the specimen.
interface.
4.2 Bead the cleaned tungsten rod over the area to be
2.1.2 fault—a tungsten-glass seal in which a fissure, either
examined with glass, of the type and wall thickness commonly
delineated by a line of bubbles or in itself clearly discernible,
used for beading, to a length of not less than 5 mm bead length.
is observed when inspected as prescribed in this test method.
4.3 To permit examination of the gla
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.
Loading comments...