ASTM F29-97(2022)

Annotation of standard text ASTM F29-97(2022) :

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.


Keywords:
gloss-to-metal sealing, iron-nickel/copper composite wire, vacuum electronics,, ICS Number Code 31.240 (Mechanical structures for electronic equipment)