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topic 8279

Finish Thickness



I am looking for a range of thickness for most finishes used in ferrous and non-ferrous metals:

different types of anodizing
powder coating
different types of paint
black zinc
black oxide

I understand there is variability. I'm just looking for a range.

Stan D [last name deleted for privacy by Editor]
Ericsson - Lynchburg, VA, USA


My experience has been with primer that are about 1 mil thick and topcoats that are about 2 mils thick. Epoxy and polyurethane respectively.

Kelly Draper
Systems & Electronic Inc. - West Plains, Missouri, USA


You are likely to find most answers in the Metal Finishing Guide and Directory Issues, year 2000 (organic) and 2001 (inorganic) published by Metal Finishing magazine.

Mandar Sunthankar
- Fort Collins, Colorado


Hope this is of use as we do a little of most of these Different types of anodising ñ all depends on the alloy being anodised.

Chromic about 2.5 to 5 microns 0.0001-0.0002î
Sulphuric from 8 to 25 microns 0.0003-0.0010î
(with sulphuric 25 microns is about the top you can get)
Hard anodising 25-75 microns 0.001-0.003î typical - normal thickness 50 microns
(we have put on 200 microns 0.008î but this I would call exceptional and not to be expected on all alloys)

Powder coating:

Not a clue!

Different types of paint:

Can vary - 8 microns is the lightest primer we do and this is on the edge of what is possible. We would like to put on 15-25 microns primer and 25-50 microns top coat.

Black zinc:

This is applied to a zinc plated finish the zinc can be 5-25 microns with a normal thickness of 10-15 microns (0.0004-0.0006î).

Black oxide:

Thin ñ very thin normally in the microns range.
Martin Trigg-Hogarth
Martin Trigg-Hogarth
surface treatment shop - Stroud, Glos, England


Water-based inorganic zinc coatings: 0.2-0.5 mils.

Steve Sarmiento
- Chardon, Ohio, USA


Spray paint 1.5 ± 0.2 mils total. for most common finishes. Coil coating 0.5 to 1.0 mils for most common finishes depending on whether primer is used.

Ron Zeeman
Continuous - Brampton, ON, CAN

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