Homebrew PCBs

From: "multidigital15" <jboavida@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Friday, November 20, 2009 9:42 AM
Subject: [Homebrew_PCBs] Coating: Acrylic or Silicone based?


> Hi,
>
> I have some PCB's in a place with a lot of moisture (basically the system 
> is on the top of a small moutain around 1000 meters above sea level).
>
> Normally I use Kontak Chemie's Plastik 70 to protect my PCB's, but in this 
> case it does not work. Yesterday in a preventive maintenance I had found 
> that the PCB tracks are almost gone with corrosion.
>
> I need advice how to protect the PCB's in this environment. I had see that 
> acrylic and silicone based coating products exist on the market. I guess 
> silicone based are better for  this applications, but I'm not sure. Can 
> anyone advise some produts to better solve this problem?

Conformal coating?

Leon

> Hi,
>
> I have some PCB's in a place with a lot of moisture (basically the system is on the top of a small moutain around 1000 meters above sea level).
>
> Normally I use Kontak Chemie's Plastik 70 to protect my PCB's, but in this case it does not work. Yesterday in a preventive maintenance I had found that the PCB tracks are almost gone with corrosion.
>
> I need advice how to protect the PCB's in this environment. I had see that acrylic and silicone based coating products exist on the market. I guess silicone based are better for  this applications, but I'm not sure. Can anyone advise some produts to better solve this problem?
>
>
> Thanks in advance
> Joaquim
>
>
>
> ------------------------------------
>
> Be sure to visit the group home and check for new Links, Files, and Photos:
> http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
>
>
>
>

-----Original Message-----
From: "multidigital15" <jboavida@...>
Sent 11/20/2009 3:42:32 AM
To: Homebrew_PCBs@yahoogroups.com
Subject: [Homebrew_PCBs] Coating: Acrylic or Silicone based?Hi,
I have some PCB's in a place with a lot of moisture (basically the system is on the top of a small moutain around 1000 meters above sea level).
Normally I use Kontak Chemie's Plastik 70 to protect my PCB's, but in this case it does not work. Yesterday in a preventive maintenance I had found that the PCB tracks are almost gone with corrosion.
I need advice how to protect the PCB's in this environment. I had see that acrylic and silicone based coating products exist on the market. I guess silicone based are better for  this applications, but I'm not sure. Can anyone advise some produts to better solve this problem?
Thanks in advance
Joaquim
------------------------------------
Be sure to visit the group home and check for new Links, Files, and Photos:
http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
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[Non-text portions of this message have been removed]

>
> We use this product for MIL board here at work.http://www.humiseal.com/Datasheets/English/acrylics/1b31_english_tds.pdf
> I have never seen it fail even in our humidity testing.Jim Hannon
> http://www.fmtcs.com/web/jmhannon/
> 42,11.90N,91,39.26W
> WB0TXL
> -----Original Message-----
> From: "multidigital15" <jboavida@...>
> Sent 11/20/2009 3:42:32 AM
> To: Homebrew_PCBs@yahoogroups.com
> Subject: [Homebrew_PCBs] Coating: Acrylic or Silicone based?Hi,
> I have some PCB's in a place with a lot of moisture (basically the system is on the top of a small moutain around 1000 meters above sea level).
> Normally I use Kontak Chemie's Plastik 70 to protect my PCB's, but in this case it does not work. Yesterday in a preventive maintenance I had found that the PCB tracks are almost gone with corrosion.
> I need advice how to protect the PCB's in this environment. I had see that acrylic and silicone based coating products exist on the market. I guess silicone based are better for  this applications, but I'm not sure. Can anyone advise some produts to better solve this problem?
> Thanks in advance
> Joaquim
> ------------------------------------
> Be sure to visit the group home and check for new Links, Files, and Photos:
> http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
> Individual Email | Traditional
> http://docs.yahoo.com/info/terms/
> 
> [Non-text portions of this message have been removed]
>

>
> I use this spray for coating, so far it does well:
> 
> <http://uk.rs-online.com/web/search/searchBrowseAction.html?method=searchProducts&searchTerm=%09ERDCA200H&x=35&y=22>
> 
> Try to find out if your coating has cracked or just poor adhesion. If
> you etch your own boards rinse/wash them really really well and
> perhaps neutralise after etching with a soak in sodium bicarbonate or
> something. Etchant residue is a big hassle in terms of corrosion.
> 
> ST
> 
> On Fri, Nov 20, 2009 at 10:42 AM, multidigital15
> <jboavida@...> wrote:
> > Hi,
> >
> > I have some PCB's in a place with a lot of moisture (basically the system is on the top of a small moutain around 1000 meters above sea level).
> >
> > Normally I use Kontak Chemie's Plastik 70 to protect my PCB's, but in this case it does not work. Yesterday in a preventive maintenance I had found that the PCB tracks are almost gone with corrosion.
> >
> > I need advice how to protect the PCB's in this environment. I had see that acrylic and silicone based coating products exist on the market. I guess silicone based are better for  this applications, but I'm not sure. Can anyone advise some produts to better solve this problem?
> >
> >
> > Thanks in advance
> > Joaquim
> >
> >
> >
> > ------------------------------------
> >
> > Be sure to visit the group home and check for new Links, Files, and Photos:
> > http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
> >
> >
> >
> >
>