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May 2005

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Subject:
From:
Russell Burdick <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Russell Burdick <[log in to unmask]>
Date:
Fri, 20 May 2005 06:17:39 -0700
Content-Type:
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I have used one vendors ENIG and the lead stabilizer in the nickel bath was
less than 10ppm, the amount codeposited with the nickel and phosphorus will
be even less.

Russ

>From: "Burtt, Nigel" <[log in to unmask]>
>Reply-To: TechNet E-Mail Forum <[log in to unmask]>,              "Burtt,
>Nigel" <[log in to unmask]>
>To: [log in to unmask]
>Subject: Re: [TN] ENIG Board finish and RoHS
>Date: Fri, 20 May 2005 14:00:47 +0100
>
>Thanks we are doing some testing of IAG finishes on both current
>non-RoHS product and prototype RoHS designs
>
>At to levels, I heard less than 800ppm Pb which is JUST under the limit,
>but Cd is above the 100ppm limit.
>
>
>
>-----Original Message-----
>From: Jeffrey Bush [mailto:[log in to unmask]]
>Sent: 20 May 2005 13:29
>To: TechNet E-Mail Forum; Burtt, Nigel
>Subject: RE: [TN] ENIG Board finish and RoHS
>
>I would advise integrated some IAG testing in with your RoHS evaluation
>programs.  Much effort in improvements are underway on the chemistry end
>and this appears to the a finish that will prevail.
>
>Note:  My understand was that the levels of banned subst. in ENIG were
>well under the RoHS limits.
>
>Jeffrey Bush
>Director, Quality Assurance and Technical Support
>
>VERMONT CIRCUITS INCORPORATED
>   76 Technology Drive - POB 1890
>     Brattleboro, Vermont 05302
>       Voice: 802.257.4571.21 Fax: 802.257.0011
>            http://www.vtcircuits.com
>
>
>-----Original Message-----
>From: Burtt, Nigel [mailto:[log in to unmask]]
>Sent: Friday, May 20, 2005 5:05 AM
>To: [log in to unmask]
>Subject: Re: [TN] ENIG Board finish and RoHS
>
>This has been discussed on this and other forums previously within the
>last year.
>
>We have been told certain types of finish chemistry for both ENIG and
>Immersion Sn can contain levels of Pb and Cd as stabilising agents and
>this can make the material deposited very close to or exceeding the RoHS
>limits. However, the chemistry suppliers are working on this and don't
>expect this to a problem in the long term. That said, if you want a RoHS
>compliant PCB now you had better check with your supplier about the
>chemistry they use to make sure they can provide it!
>
>We've used ENIG for years as our finish of choice for SMT/mixed
>technology with HASL left for conventional PTH only, but are considering
>moving to Immersion Ag as a standard for both on any reasonable volume
>RoHS compliant product where shelflife should not be an issue. This
>problem with non-RoHS compliant ENIG is part of that decision, but
>mostly the occasional batch of ENIG that has solderability problems with
>no-clean fluxes is a difficulty that won't go away. Pb-F HASL is
>available but not falt enough for SMT I feel and I understand this
>process still has its own problems for the PCB manufacturers too - maybe
>early days?
>
>Does anyone think Immersion Ag is a very bad idea?
>
>
>Nigel Burtt
>Production Engineering Manager
>Dolby Labs - European HQ
>Email: [log in to unmask]
>Tel:     +44 (0)1793 842132 [direct line with voicemail]
>Fax:    +44 (0)1793 842101
>
>
>-----Original Message-----
>From: Jason Gregory [mailto:[log in to unmask]]
>Sent: 19 May 2005 23:17
>Subject: Re: ENIG Board finish and RoHS
>
>Methinks that is a really good question.
>
>Jason Gregory
>Manufacturing Engineer
>Innova Electronics
>(281)653-5593
>(281)653-5594 fax
>(281)212-0844 cell
>[log in to unmask]
>
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]]On Behalf Of Bob Donaldson
>Sent: Thursday, May 19, 2005 4:58 PM
>To: [log in to unmask]
>Subject: [TN] ENIG Board finish and RoHS
>
>
>I had an interesting question come up. One of my customers questioned
>whether ENIG board finishes were RoHS compliant because in their metal
>finishing world nickel plating baths commonly used lead in them to help
>in the plating. So I asked a boardshop I was working with if the ENIG
>processing they were using had lead in the nickel plating baths. They
>said it did so we both were wondering if this makes ENIG a non compliant
>finish for RoHS. Can someone please shed light on whether this is true
>or not?
>If it is compliant must the platers remove lead form their baths or is
>the concentration so low it falls within the accepted criteria?
>
>Thanks,
>Bob D.
>
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