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ASTM Designation: B 734

Copper in color and matte to a very shiny finish. Good corrosion resistance when used as undercoat. A number of copper processes are available, each designed for a specific purpose. Brightness (to eliminate the need for butting); High speed (for electroforming); Fine grain (to prevent case hardening); etc.

Electrodeposited Copper for Engineering Uses Classification

The electrodeposited copper is classified according to thickness of the electrodeposit in the following table:

ClassMinimum Thickness, ┬ÁM

25
25
20
20
12
12
5
5
X
Thickness specified

* No relationship exists between class numbers and degree of corrosion resistance. Class numbers have been assigned on the basis of traditional usage and for compatibility with national standards.

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