I have been in this situation, but with a polycarbonate case material. I went with the nickel based spray and it adhered and perfromed well. I used a spring contact from the PCB to the case to ground the shielding. In this case, I was shielding from RFI entering the enclosure, not exiting. You may need multiple coats depending on the strength of your source. Andrew On Fri, Jan 18, 2013 at 1:09 PM, Josh Koffman wrote: > Hi all, > > For the project I mentioned in my other post, I'm considering making > my own enclosure. I've become a bit better with that sort of simple > mechanical design, and it would allow me to build in guards to prevent > unwanted switch presses and protect cables and connectors a bit. This > isn't anything really complex, just a bit more than a standard > rectangular case. > > If I go this way, I'll have to use some sort of easily machinable > material, such as nylon, delrin, or some kind of HDPE. No problems > there, but since this device will be used with a radio nearby, I think > it should be shielded to help prevent interference. As a result, I'm > looking for ideas on how to shield the inside of a plastic enclosure. > I have found a couple of sprays that are available locally, but I'm > not sure which is more suited to my application. > > The first is MG Chemicals 838 > http://www.mgchemicals.com/products/protective-coatings/emi-rfi-shielding= /total-ground-carbon-conductive-coating-838/ > This appears to be a carbon spray designed for shielding and creating > conductive ESD free surfaces. > > The second is MG Chemicals 841 > http://www.mgchemicals.com/products/protective-coatings/emi-rfi-shielding= /super-shield-nickel-841/ > This is a spray with nickel in it. > > I think the nickel spray would be better, but I'm not entirely sure. > I'm also not sure how well either of those would stick to the plastics > I'm looking at. Another option might be to try to adhere some aluminum > foil to the inside surfaces of the enclosure. > > Any thoughts on which might be the more appropriate path to take? > Alternative ideas are definitely welcome! > > Thank you! > > Josh > -- > A common mistake that people make when trying to design something > completely foolproof is to underestimate the ingenuity of complete > fools. > -Douglas Adams > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .