Distance I stay away can depend on what the keep-out area actually is. If coating near a connector that I know is prone to wicking, for example, I'll program to stay a little farther away than I will from something less critical. 



Ryan Elson

Manufacturing Engineer

Bently Nevada

Baker Hughes, a GE company

Cell: 775-790-5182

[log in to unmask]

 

1631 Bently Parkway South

Minden, NV 89423, United States 



-----Original Message-----

From: TechNet [mailto:[log in to unmask]] On Behalf Of lduso - Diamond-MT.com

Sent: Wednesday, December 06, 2017 11:10 AM

To: [log in to unmask]

Subject: EXT: Re: [TN] IPC-CC-830 (Conformal Coat)



As Doug says, whatever you want that meets your needs. It is not by any means necessary to design in a "dmz of coating" but you can. And it will be greatly appreciated by your coater.



Honestly, from receiving hundreds of different drawings/specs for coating application,  the predominant call-out is ..... nothing. Most drawings and specs only call-out what is to be coating free. For example "Coat board with IPC -830 approved UR, do not coat J1-J7 and all played mount holes."

It's up to me to decide how close to J1 to get with the coating. I once coated the leads of all the fine-pitch connectors and the customer said that was too close. The next customer will reject the work if I don't coat the leads.



On Dec 6, 2017 10:18 AM, "Jack Olson" <[log in to unmask]> wrote:



> I don't know what staking is, and I think they are trying to avoid 

> masking/demasking.

> The goal is to spray everything except the mounting holes and a few 

> exposed metal areas that we are using for thermal reasons.

> I was told I need to leave an "overspray zone" as neutral territory 

> between those two types of areas

>

> On Wed, Dec 6, 2017 at 9:12 AM, Tan Geok Ang <[log in to unmask]> wrote:

>

> > Staking? Masking / De-masking?

> >

> > ------------------------------

> >

> > *From:* Jack Olson <[log in to unmask]>

> > *Date:* 6 December 2017 at 10:48:41 PM SGT

> > *To:* [log in to unmask] <[log in to unmask]>

> > *Subject:* [TN] IPC-CC-830 (Conformal Coat)

> >

> > What should a designer use as an "overspray zone" for conformal coating?

> > I would like to keep components and vias away from areas that will 

> > NOT be coated.

> > I don't know why 3mm sticks in my mind, but I can't find anything in

> > IPC-CC-830 about it

> > (including the new Working Draft)

> > I also downloaded the new Conformal Coat ebook from 007 and can't 

> > find it there, either!

> >

>