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Does anodization provide good insulation?

Does anodization provide good insulation?

Does anodization provide good insulation?

(OP)
I know it typically blocks a decent chassis ground connection for a screw terminal.  You have to mask the terminal off before the part is anodized, scrape through the coating  afterward,  or use a star washer to 'bite' through it.  

Is it a reliable insulator though?  Has anybody seen any specs on the resistance?  


Thanks,

John D

RE: Does anodization provide good insulation?

I will second the answer that regular anodizing should NOT be relied upon as an insulator... Hard anodizing is considered an insulator but again I would not rely on it either..  

RE: Does anodization provide good insulation?

There are many different types of "electrically insulative" powder coats available on the market with published dielectric strengths (1200V/mil,etc..).... If I needed to rely on a finish for an insulator I would go that way...
I have used this before with great results on laminated bus bar applications,etc... http://www.rohmhaas.com/wcm/products/product_detail.page?product=1121028

RE: Does anodization provide good insulation?

(OP)
Thanks all!  

John D
 

RE: Does anodization provide good insulation?

It's actually perfectly reliable. It'll be a good insulator when you wish it would conduct, and it'll somehow start conducting when you expect it to insulate. winky smile  

RE: Does anodization provide good insulation?

(OP)
Perfectly!   

RE: Does anodization provide good insulation?

technically it is an insulator, but it is only thousands of angstroms thick.  So the slightest scratch and it is a conductor again.  I would not count on it.  If there were an additional layer of kapton tape, then maybe its ok.

www.MaguffinMicrowave.com

Maguffin Microwave wireless design consulting

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