surface resistivity

[dho]

i am hit by a requirement, the surface resistivity.
to prevent any electrical energy stored on the surface, the surface resistivity must be between 1 megohm per square and 100 megohm per square.
my unit are made from anodized aluminum. i searched the internet for a number and could not find one.
is there a published document on such information?
thanks.

 

[KENAT]

First off, what grade & type of anodize

For instance 'Hard Anodize' is thicker and more resistive than some other types.

Not saying you can trust it in isolation but a quick Google search got me:

http://www.techbriefs.com/component/content/article/5-ntb/tech-briefs/materials/1159

http://lmgtfy.com/?q=surface+resistivity+anodized+aluminum

Posting guidelines faq731-376

http://eng-tips.com/market.cfm?

(probably not aimed specifically at you)
What is Engineering anyway: faq1088-1484​

 

[dho]

MIL-A-8625, Type II, class 2.
strange unit "ohm.cm" in

http://www.techbriefs.com/component/content/article/5-ntb/tech-briefs/materials/1159

the unit suppose should be "ohm per square".
thanks.

 

[KENAT]

Unless they are measuring based on thickness of anodize layer?

Posting guidelines faq731-376

http://eng-tips.com/market.cfm?

(probably not aimed specifically at you)
What is Engineering anyway: faq1088-1484​

 

[dho]

i will think the thickness of the anodize layer may impact the surface resistivity, but by definition, the unit should be ohm per square.
so, that article either not valid or needs correction.
not too much info online.

 

[IRstuff]

It's very well explained here:

http://en.wikipedia.org/wiki/Sheet_resistance

TTFN
faq731-376

Need help writing a question or understanding a reply? forum1529


Of course I can. I can do anything. I can do absolutely anything. I'm an expert!
There is a homework forum hosted by engineering.com:

http://www.engineering.com/AskForum/aff/32.aspx