I would talk to your conformal coating supplier based upon what you
decide to use. We use Humiseal 1B73 LOC, chosen for volatile emissions,
and clean the no-clean residues off before coating.

Blair

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of [log in to unmask]
Sent: Wednesday, September 13, 2006 7:28 PM
To: [log in to unmask]
Subject: Re: [TN] bareboard cleanliness related to surface finish

Hi Folks:  My company is beginning to be asked by several  customers for
conformal coating on their PCB assemblies.  We are currently  building
to IPC-A-610 using a combination of SMT and T/H technology in a
no-clean manufacturing process flow.  From my old PCB days, I remember
problems with PCB cleanliness and conformal coating peeling off the PCB
surface.

What are folks using today for a conformal coating in a no-clean
manufacturing environment?  Do I need to worry about cleanliness at all
today?  With RoHS and lead-free processing/PCB finishes how are surface
contamination levels affected??

I'm just looking for some basic information to point me in the right
direction.....rather not have to re-invent the wheel.  Thought this
would  be the perfect forum for this type of question!!!!

Thanks in advance for any help and guidance you folks may
provide!!!!!!!

Sincerely,

William E. Black
Medco
Quality Assurance Manager
Tel:   1 631 667 9699
e-mail:  [log in to unmask] (mailto:[log in to unmask])




























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