Here is a progress report for all that have participated.
I contacted Hubbell about two weeks ago and ask about the variation in specifications for the 8300HI (20 amp Hospital grade, Ivory color).
I have samples of three versions, each have high quality construction with same electrical specifications, but are constructed from completely different materials and plating and various ground strap designs.
Not commonly known, there is a special version of this outlet that is ALL copper construction, including the back strap, mount ears and current and ground clamps. This particular version has NO plating whatsoever. It is 20 amp, heavy construction and true Hospital grade and is marked as such.
I had a brief argument via email with a manufacturer that told me these were in fact plated, and even though I had a sample, I could not convince him otherwise.
I now have everyone's outlets in hand as of 4:30 this afternoon and they ARE NOT plated. I did have to UPS in a special order, as these were not in stock at any supply houses in Dallas.
I will ship everything Monday the 11th for treatment, and will post here as soon as I know the turn time for the immersion tanks at NASA to complete the process.
Thanks to everyone for remaining patient with me. Needless to say I am excited that the quality of this project is absolutely on target.