Many thanks to each respondent (Cortland, Richard, Donald, Chris, Jim, Gary, Ron -- hope I didn't miss anyone). The comments (and in some cases comments on the comments) were very useful.
I learned that Iridite (brand name) = Chromate, corrosion protection is inversely related to conductivity, and the crime lab has a partner in fingerprint tracking. Thanks for sharing your experience and knowledge. Don > ---------- > From: Cortland Richmond[SMTP:[email protected]] > Reply To: Cortland Richmond > Sent: Wednesday, December 02, 1998 2:01 AM > To: Richard Haynes; ieee pstc list > Subject: Re: Coatings that affect EMC performance > > About ten years ago I had to write a critical features list on a piece of > equipment that used yellow chromate over aluminum. It turned out not to > be > too difficult; silver was too little, yellow and brown were too much and > "waay" too much respectively. Only a light gold tint was correct. > > Holding the vendor to that,on the other hand... > > Cortland > > ====================== Original Message Follows ==================== > > >> Date: 30-Nov-98 21:27:31 MsgID: 1065-66891 ToID: 72146,373 > From: "Richard Haynes" >INTERNET:[email protected] > Subj: Re: Coatings that affect EMC performance > Chrg: $0.00 Imp: Norm Sens: Std Receipt: No Parts: 1 > > > Don, > The "yellow..." could mean a yellow chromate film(coating) on aluminum > metal(for example) applied for corrosion protection. The advice not to > used > is because of the high impedance. The film EMC people use is clear because > of the low impedance. For yellow, purple, etc there is good corrosion > resistance whereas the clear coating is low corrosion resistance but also > low Z). So we have the compromise between low Z and low corrosion > resistance > or high Z and high corrosion resistance. There are also porosity of the > film > with processing conditions. > > This is my best guess with the information available. > > Be glad to help you on more specifics. > > Richard Haynes > 609-497-4584 > > -----Original Message----- > From: UMBDENSTOCK, DON <[email protected]> > To: 'EMC-PSTC Discussion Group' <[email protected]> > Date: Monday, November 30, 1998 6:06 PM > Subject: Coatings that affect EMC performance > > > >Hello Group, > > > >I remember recently (within the last quarter?) reading a thread about > >different coatings, one of which everyone said "don't use". I have > searched > >through the RCIC "Recent Threads" and could not find a related subject. > Can > >anyone steer me to that thread? (something about "yellow ____"?) > > > >Regards, > > > >Don Umbdenstock > >Sensormatic > > > >--------- > >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). > > ====================== End of Original Message ===================== > > --------- > 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).
