Acrylic based coats are being used in most cases. if the boards are not
clean then all possibility of peeloffs and patches can be expected. Try
humiseal.

Thanx
Badri

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of [log in to unmask]
Sent: Thursday, September 14, 2006 4:58 AM
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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