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"Mirror finish" -- is there a standard definition?

Is there an industry standard meaning to the term "mirror finish"?

John White
OEM Process Equipment Manufacturing Engineer - Santa Clara, California, USA
October 7, 2009

Surface comparators display finishes that emulate mirrors from 4 microinches down normally produced by lapping.

Guillermo Marrufo
Monterrey, NL, Mexico
October 11, 2009

Short answer: No.
You can get a mirror finish on a relatively coarse uneven surface as well as a smooth surface. Normally it is suggested that an Rms/Rz be given as well as as an appearance designation in lieu of an acceptable finish part.

AF Kenton
retired business owner - Hatboro, Pennsylvania
October 14, 2009

October 28, 2009

There are two type of mirror finish on stainless steel.

1)No. 7 mirror finish is a directional mirror finish in which there are still visible polishing lines left on the surface.

2) No. 8 mirror finish is a "bathroom like" mirror finish where no polishing grit lines are visible.

www.ssina.com and www.nidi.org has free literature that describes these finishes.

Michael Liu Taylor
specialty stainless steel distributor - Dallas, Texas

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