Dave

Any chance I could have a copy of that please?

Regards Graham Naisbitt

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Concoat Limited
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> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Dave Hillman
> Sent: 20 March 2002 14:15
> To: [log in to unmask]
> Subject: Re: [TN] Conformal Coating BGA's
>
>
> Hi Bruce! We are routinely putting acrylic conformal coating over plastic
> BGA components without using underfill for avionics use environments. We
> did a fair amount of testing looking both at paraylene and acrylic prior
> implementation. This work was published at the IPC APEX 2000 Conference in
> Long Beach (the paper title was "An Investigation of the Effects
> of Printed
> Wiring Board Surface Finish and Conformal Coating for Ball Grid Array
> Assembly"). Can you expand on your concern of "entrapped air"? We have not
> seen any issues for that topic after 2 years of production experience.
>
> Dave Hillman
> Rockwell Collins
> [log in to unmask]
>
>
>
>
> "Misner, Bruce" <[log in to unmask]>@ipc.org> on 03/19/2002 01:48:38 PM
>
> Please respond to "TechNet E-Mail Forum." <[log in to unmask]>;
> Please respond
>        to "Misner, Bruce" <[log in to unmask]>
>
> Sent by:    TechNet <[log in to unmask]>
>
>
> To:    [log in to unmask]
> cc:
>
> Subject:    [TN] Conformal Coating BGA's
>
>
> My question of the day: Is anyone conformal coating (not parylene) plastic
> BGA's on FR-4 in Hi-Rel applications (aircraft; -20 to +71C ambient
> operating temperature requirement) without benefit of an
> underfil?  If yes,
> has entrapped air been a major issue?  Anyone care to comment on this
> approach?
>
> Regards,
> Bruce Misner
>
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