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September 2009

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Subject:
From:
"Stadem, Richard D." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Stadem, Richard D.
Date:
Wed, 30 Sep 2009 11:57:39 -0500
Content-Type:
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text/plain (121 lines)
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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