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TechNet E-Mail Forum <[log in to unmask]>, Inge <[log in to unmask]>
Date:
Thu, 14 May 2009 22:12:47 +0200
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http://www.lineagepower.com/BinaryGet.aspx?id=03acde1a-bafa-4450-827e-9e2c265ea998&prp=true

Inge


----- Original Message ----- 
From: "John Parsons" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, May 14, 2009 9:56 PM
Subject: Re: [TN] Bare PCB Packaging Requirements


> Thanks all so far for your input - keep them coming.  Just to be clear, 
> the
> requirement for moisture barrier, the inclusion of a desiccant or moisture
> indicator tab was not being questioned but we have received a requirement 
> to
> ship in only ESD safe bags.  This is the first request of this kind for us
> so I was wondering how wide spread the requirement was.  This method of
> packaging requires different equipment than we typically use.  It is also
> not too often in our business that the customer is not concerned with 
> cost.
> Must be nice to be Inge's supplier ;o)
>
> Regards
> John Parsons
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Rob Strecker
> Sent: Thursday, May 14, 2009 12:43 PM
> To: [log in to unmask]
> Subject: Re: [TN] Bare PCB Packaging Requirements
>
> John,
> We have recently asked our PCB supplier to start shipping our boards to
> us in MBB's.  We did this to protect the boards from moisture as well as
> protect the surface finish.  We have seen a lot of delamination since
> going lead free and it's the last thing we can do to ensure it's not due
> to moisture absorption.  I believe the new IPC-1601 will stipulate this.
>
> Rob Strecker
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
> Sent: Thursday, May 14, 2009 1:12 PM
> To: [log in to unmask]
> Subject: Re: [TN] Bare PCB Packaging Requirements
>
> 1. The same moisture barrier bags that are ESD-safe Faraday bags also
> work well as moisture barrier bags for shipping and storing PWBs. These
> Faraday bags often work well for storage of the CCA during assembly. Why
> use two different types of bags if one fits the bill? Non-ESD
> polyethylene bags are notorious ESD generators. I wouldn't want them in
> my factory.
>
> 2. Many CEMs and OEMs have requirements for the PWBs to be shipped in
> MBBs, in order to prevent against surface finish oxidation in the case
> of IAg, ISn, HASL and FTL finishes. Some invoke a requirement such as
> IPC 4552 or 4553 in order to ensure the boards are dry and hermetically
> sealed.
>
> 3. All PWBs absorb moisture from the air. Having the boards sealed
> prevents excess moisture ingress, in some cases if the boards are
> shipped in sealed bags with desiccant, the user may not need to pre-bake
> if they are able to successfully perform Kanban pull from the fabricator
> within a short time frame. This, of course, requires qualification and
> validation of the process and procedures.
>
> So, if a bag is required, use one from start to finish that meets
> multiple requirements.
>
> I assume you understand why moisture within the PWB is not a desirable
> condition.
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of John Parsons
> Sent: Thursday, May 14, 2009 1:37 PM
> To: [log in to unmask]
> Subject: [TN] Bare PCB Packaging Requirements
>
> Tell us, how many CEM's out there are demanding that bare PCB's be
> received
> in vacuum sealed moisture barrier anti-static bags.  If so, what is your
> reasoning?  Just to be clear my focus here is "anti-static" not the
> moisture
> barrier properties of the packaging.
>
>
>
> Regards
>
>
>
> John Parsons
>
>
>
>
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