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October 2012

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Subject:
From:
Vladimir Igoshev <[log in to unmask]>
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Date:
Tue, 30 Oct 2012 16:51:01 +0000
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As always it depends :-)
Regards,

Vladimir

SENTEC Testing Laboratory Inc.
11 Canadian Road, Unit 7.
Scarborough, ON M1R 5G1
Tel: (416) 899-1882
Fax: (905) 882-8812
www.sentec.ca

-----Original Message-----
From: Victor Hernandez <[log in to unmask]>
Sender: TechNet <[log in to unmask]>
Date: Tue, 30 Oct 2012 11:31:46 
To: <[log in to unmask]>
Reply-To: TechNet E-Mail Forum <[log in to unmask]>,
        <[log in to unmask]>
Subject: Re: [TN] ImAg thickness measurement / verification methods

We also use XRF for plating thickness, but to identify other alloys, Pd, without having to do SEM/EDX.

Victor,

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Vladimir Igoshev
Sent: Tuesday, October 30, 2012 10:54 AM
To: [log in to unmask]
Subject: Re: [TN] ImAg thickness measurement / verification methods

Hi Kevin,

We do have XRF but I;d have to look up the IPC to see what special requirements are. 

We mainly use XRF for ENIG boards.

Another way to estimate plating is EDS combined with a simulation software.
Regards,

Vladimir

SENTEC Testing Laboratory Inc.
11 Canadian Road, Unit 7.
Scarborough, ON M1R 5G1
Tel: (416) 899-1882
Fax: (905) 882-8812
www.sentec.ca

-----Original Message-----
From: "Glidden, Kevin" <[log in to unmask]>
Sender: TechNet <[log in to unmask]>
Date: Tue, 30 Oct 2012 14:16:14
To: <[log in to unmask]>
Reply-To: TechNet E-Mail Forum <[log in to unmask]>,
        "Glidden, Kevin"
	<[log in to unmask]>
Subject: [TN] ImAg thickness measurement / verification methods

Hi everyone,

Hoping all 'Netters in the path of Sandy are safe and sound today.

I am looking for someone who can verify ImAg plating thickness in the range of 5 to 12 micro-inches applied over copper using XRF techniques.  The IPC-4553 specification indicates this might be more difficult to achieve for silver than for other finishes, and requires some specialized equipment and calibration methods.  I am looking to have this done on around 5 or 6 PCBs only.  Offline responses / quotes are OK.

As a follow up, is anyone out there using XRF or other measurement techniques to measure thickness of finish platings as part of PCB incoming inspection criteria?  If so, what equipment(s) are required and what would be the estimated investments?

We periodically see ImAg finish boards that show copper through on the second side after only one pass through SMT reflow.  We spec 5-12 micro-inches, but sometimes measurements have shown we are getting as little as 2 to 3.  I am wondering if it is warranted to sample incoming lots for verification.

Thanks,

Kevin Glidden


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