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Surface Roughness of #8 mirror finish

Surface Roughness of #8 mirror finish

Surface Roughness of #8 mirror finish

(OP)
Hello,
I purchased a sheet of aluminum from McMaster Carr with a #8 mirror finish.  I can not seem to find an information that relates this surface roughness.  Anyone know?
thanks.

RE: Surface Roughness of #8 mirror finish

Possibly the #8 mirror finish means a surface rougness of 8 microinches, root mean square (rms). Surface roughnesses in microinches usually run in the sequence 4,8,16,32,64,128,256...,etc. The 8 microinch finish is quite smooth and could be qualitatively called a "mirror" finish.  

RE: Surface Roughness of #8 mirror finish

Don't think that's the rule.  The #4 finish is "satin" brushed, so the sequence goes the wrong direction.  

Also, M&C have a finish called "reflective"

You should probably call or email them

TTFN

RE: Surface Roughness of #8 mirror finish

(OP)
Believe it or not, they didn't have that info.

RE: Surface Roughness of #8 mirror finish

Yeah, got the same lame answer.  pretty pathetic.

Have you gotten the material yet?

TTFN

RE: Surface Roughness of #8 mirror finish

(OP)
Yea, got it late last week.  It has a really nice mirrored finish.  You could shave in it.  I suspect it is in the low single digit microinch range or better....but I haven't held a lot of very flat/smooth materials in my hands either so I am just speculating.

RE: Surface Roughness of #8 mirror finish

(OP)
Great, thank you for the help!  One other note of interest if anyone is considering ordering on of these plates.  While the surface is really nice, the flatness at the outer edges is horrible due to the cleaving of the plate into a square.  Also, McMaster sent the plate in a box with no padding or packing outside of a sticker to protect the finish.  It is riddled with dents & dings...

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