The authoritative public forum
  for Metal Finishing since 1989
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Metal finishes

2003

I'd like to find a comparison table or something else between the following:
- Grit No.
- Mill No.
- Ra (micrometer or microinch)
- "mirror finish"
- mechanical polishing
- electropolishing

Thank you very much,

Cristina Speciale
- Milano, Italy

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There are charts available for the first two items, but they are unrelated. See organizations on home page for that info and their addresses. The other 4 items you requested are not or do not have charts because they are subjective terms. Meaning, an RA is a measurement result of a measuring device. A mirror finish does not necessarily have a relationship to RA. The last two items are processes to achieve surface modification on materials.

AF Kenton
retired business owner - Hatboro, Pennsylvania
2003