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Roughness Average conversions to grit numbers?

What does a mirror polished stainless steel surface with a Ra (Roughness average) value of 1 microinch converts to in grit numbers?

Michael Liu Taylor
specialty stainless steel distributor - Dallas, Texas
2007

2 or 3 micrometers diamond polishing compounds are often used to produce such roughness on steels and other substrates.

Guillermo Marrufo
Monterrey, NL, Mexico
2007

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