ASTM F29

This specification covers the properties and requirements for round, copper-coated 42 % nickel-iron wire, commonly known as dumet, intended primarily for sealing to soft glass. The wires shall conform to requirements stated for chemical composition, oxide coatings, dimension, internal and surface workmanship, and storage characteristics. Materials shall also undergo tests for thermal expansion, color of coating, diameter, reducible oxides, copper analysis, and metallography.

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.

1. Scope

1.1 This specification covers round, copper-coated 42 % nickel-iron wire, commonly known as dumet, intended primarily for sealing to soft glass.

1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered 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 and health practices and determine the applicability of regulatory limitations prior to use.

2. Referenced Documents

ASTM Standards
B170 Specification for Oxygen-Free Electrolytic Copper--Refinery Shapes
D1535 Practice for Specifying Color by the Munsell System
D1729 Practice for Visual Appraisal of Colors and Color Differences of Diffusely-Illuminated Opaque Materials
E228 Test Method for Linear Thermal Expansion of Solid Materials With a Push-Rod Dilatometer
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E3 Guide for Preparation of Metallographic Specimens
E53 Test Method for Determination of Copper in Unalloyed Copper by Gravimetry
F14 Practice for Making and Testing Reference Glass-Metal Bead-Seal

Index Terms

gloss-to-metal sealing; iron-nickel/copper composite wire; vacuum electronics; Dumet wire; Electrical conductor wire--specifications; Electronic materials/applications--specifications; Glass--specifications; Glass electronic seals; Metal electronic components/devices--specifications; Nickel electrical/electronic applications--specifications; Seals--electronic applications (specifications); Wire--electronic devices; ICS Number Code 31.240 (Mechanical structures for electronic equipment)

Citing ASTM Standards

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