It certainly does. I was confused by that statement, never heard of IAg
being a problem with Class 3 before. There are satellites in space,
avionics controls, military applications, medical applications, etc,
etc, that have IAg PWBs.
Simply not a problem.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ian Hanna
Sent: Wednesday, September 30, 2009 11:47 AM
To: [log in to unmask]
Subject: Re: [TN] Immersion Silver for Class 3 Boards
Read the specification carefully Chet
1.4.2 Contact Surfaces 'The use of imm. Silver...is not currently
recommended for...Class 3'. I found nowhere else in the document that
mentions this finish as being unsuitable for Class 3 application. Table
3-1 of the same (IPC-4553) gives acceptability criteria for all three
classes...
Sounds like this surface finish is only 'not recommended' for Class 3
applications with contact surfaces...
Hope this helps
Cheers -- Ian
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Harner, Chester
Sent: Wednesday, September 30, 2009 11:03 AM
To: [log in to unmask]
Subject: [TN] Immersion Silver for Class 3 Boards
The revised Immersion Silver IPC spec (4553A) indicates that Immersion
Silver is not recommended for Class 3 boards. There is no stated reason.
I have been looking into Immersion Silver for all the same reasons as
everyone else, to replace HASL for flatness etc. It looked very good
until the Class 3 problem.
Does anyone know why IAg would not be recommended for Class 3 boards?
Chet Harner Sr. Engineer Crane Hydro-AirePO Box 7722 Burbank Ca -
91510 818-526-2600 x3557
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