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What is the hardness of a rhodium plate?

What is the hardness of a rhodium plate? Correct Answer 540-640 Vickers

The hardness of rhodium plate is between 540 and 640 Vickers and it has a wear resistance between that of nickel plate and chromium plate. The hardness of chromium plate is 950-1050 Vickers, whereas that of nickel plate is 140-425 Vickers.

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#2 : Three of them agree that the plate ends with 12L.
#3 : Three of them think that the second letter is X, and a different three think that the third letter is K.

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