Bill, We had conductive epoxies back in the 60s. It had silver powder in it. It was a mess to work with. We used it mostly on space projects.
This latest thing is an epoxy doped with fine nickel particals. When the parts are assembled under pressure the resin is squezzed out and the nickle particles make the contact between the the part and the PCB. The cured resin then both holds the part in place and makes an airtight seal. When I was first told about it by a friend I was really skeptical. We actually did make some computer memory board with this process but the company I was working for went bellyup before they could develop a viable process. Geting rid of the lead was the object. But managment was more interested in sellin g stock than developing the process. I beleive there was financial fraud involved. When I left (I QUIT) they owed me two months wages ($16K). Bob Macklin K5MYJ/7 Seattle, Wa. "REAL RADIOS GLOW IN THE DARK" ----- Original Message ----- From: "Bill Henderson" <[EMAIL PROTECTED]> To: "Bob Macklin" <[EMAIL PROTECTED]>; "Discussion of AM Radio" <amradio@mailman.qth.net>; "'Glowbugs (E-mail)" <[EMAIL PROTECTED]> Sent: Wednesday, February 02, 2005 12:36 PM Subject: Re: GB> Re: [AMRadio] Tin whiskers? > Was this one of the ancestors of "conductive epoxy"". > - Bill H. > > >About 10 years I go I worked with a proces that used nickel particals in > >epoxy resin to replace solder. The process did work but was a real mess to > >work with. We tried making surface mount PCBs with this process. The parts > >have to be mounted with the GOO and then held in position until the GOO > >cured. And we did use accelerators with the GOO but it was impractical at > >the time. > > > >Bob Macklin > >K5MYJ/7 > >Seattle, Wa. > > > >"REAL RADIOS GLOW IN THE DARK" > > > > Sent using cyberus.ca WebMail - http://www.cyberus.ca/ >
