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Specs for Rhodium
Here are the applicable specifications:
MIL-R-46085B
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 buffing); High speed (for electroforming); Fine grain (to prevent case hardening); etc. Stress relief steel parts cold straightened or suspected of having residual tensile stresses having Rockwell hardness RC35 or higher will be subjected to 375° ±25°F-24 hours within 4 hours after plating. Parts with tensile strength over 120 Ksi bake 24 hours within 4 hours after plating.
| Type Class | Thickness | Comments |
| Type I | Over nickel. silver, gold or platinum. | |
| Type II | Over other metals, requires nickel undercoat. | |
| Class 1 | .000002" min | Used on silver for tarnish resistance. |
| Class 2 | .00001" min | |
| Class 3 | .00002" min | Applications range from electronic to nose cones — wherever wear, corrosion resist solderability and reflectivity are important. |
| Class 4 | .00010" min | |
| Class 5 | .00025" min |
