Typically a carbon or gold/nickel plate over copper is recommended if the circuitry is on a printed circuit board.
The carbon will have a higher contact resistance with improved immunity to extremely corrosive environments.

Nomenclature Legend

Typical nomenclature is applied to the key with various methodologies. Standard printing will meet 250,000 to 500,000 finger activations, before showing signs of wear.

To increase cycle life, overcoats can be added. This will increase the life to 1,000,000 actuations. In correlating this to the Norman abrasion tester, this will exceed 500 cycles at 500grams of force.

Legends colors are matched to Pantone Colors with a tolerance of 1 shade. There are printing limitations on the distance between the legend and key edge:

- Silk Screen .5mm minimum from edge of key
- Convex Surface 20mm minimum key radius
- Concave Surface 30mm minimum key radius