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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.

tony kenton
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
Michael Liu Taylor
specialty stainless steel distributor - Dallas, Texas




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