Hey, I am just now writing a paper on measurements of several metals and coatings so I will just summarize some of the results: System frequency range Ohm/sq Zn 50 Hz to 3GHz ~0.1 to ~8 AgCu 50Hz to 3GHz 1 to 7 (plated Ag onto Copper particles as fillers) Ni 50 Hz to 3GHz 3 to 27 (particle fillers) Cu 50 Hz to 3GHz 1 to 10 (Metal) There are several other systems that I have measured. May get to a publication this year? Richard Haynes 609-497-4584
P.S. This is a better technique than the Z technique for absolute measurement that are reproducable. -----Original Message----- From: Douglas McKean <[email protected]> To: [email protected] <[email protected]> List-Post: [email protected] Date: Tuesday, April 13, 1999 9:26 PM Subject: Re: Conductive Paint > >Well, here's some basic stuff from my experience. > >Conductive paint cannot be used for "earth bonding". >It can be used only for shielding purposes. In other >words, don't expect to either a. pass large amounts >of current through it, b. assume it will always be >a reliable ground path, c. be able to act similar to >the ground path a metal chassis provides. > >Conductive paint is usually good for *one time* use. >In other words, don't expect the paint to survive >repeated removals and installations of the cover >to which it's applied. So use it carefully in places >where it's a "Fit and Forget" type application. > >I've dealt with two types of conductive paint, nickel >and copper. Both are somewhere around 1 to 1/2 ohm >per square depending upon a lot of factors: > >1. Composition of the paint - Acrylic based paint or > oil based paint. Oil based being the higher ohms > per square. > >2. Manufacturability - Depending upon how thick or how > many layers of the paint are applied. > >Research these topics very carefully with the paint maker >and the vendor who will apply it. > >IF the decision to use conductive paint is made, >the following information is necessary for safety: > >If the enclosure to which the paint is applied is plastic - > > a. Need UL-94V) rating of specific plastic used. > b. Need UL approval of conductive paint. > c. Need UL approval of specific plastic mfr to mold plastic. > d. Need UL approval of marriage between specific plastic > and specific conductive paint. > e. Need UL approval of mfr to do marriage of plastic > and paint. > >Regards, Doug > > >At 10:06 AM 4/13/99 -0600, JENKINS, JEFF wrote: >>Hello Group, >> >>My company is proposing to use conductive paint on our enclosures, and I >>would like your input as to the acceptability of this vis-a-vis protective >>earth bonding of enclosure panels. I am interested in the perspective of >>both European and North American requirements. >> >>This should be a generic question, but if it helps, here are the standards >>we use: >> >>EN 60950 / IEC 950 / UL 1950 / CSA 950 >>EN 50178 >>UL 1012 >>CSA C22.2 No. 107.1 >> >>Regards, >> >>Jeff Jenkins >>Senior Regulatory Compliance Engineer >>Advanced Energy Industries, Inc. >>Fort Collins, CO USA 80525 > > >--------- >This message is coming from the emc-pstc discussion list. >To cancel your subscription, send mail to [email protected] >with the single line: "unsubscribe emc-pstc" (without the >quotes). For help, send mail to [email protected], >[email protected], [email protected], or >[email protected] (the list administrators). > > --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
