Hi guys and gals !

As part of the project I'm working on, I need a sealed keypad.  I've
searched through the Internet, but I've been unable to find a keypad that
is acceptable.  What I would really like is a 20 key membrane keypad that
allows me to insert custom labels under the membrane.

I still have a few logical problems that I have to overcome, like it might
be easier if my users had a full keyboard ( similar to the ones used in
HPCs ), as they will sometimes need to enter alphanumeric data.  This is a
portable unit so it will have to be relatively small and robust ( it will
be used on the manufacturing floor ). On the other hand, I could take the
approached used by cell phones and use the number keys to enter
alphanumeric data.  For instance to enter a 'C', press a special function
key to toggle to alpha mode, then press '2' three times.  This is awkward
but would work.

What I'm looking for is advice.  I would like a solution that I can use in
a prototype and then easily move to production.

On another related note, does anyone have any experience with using custom
made membrane keypads ?

TIA,
Eric