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December 2004

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From:
Joyce Koo <[log in to unmask]>
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Date:
Mon, 20 Dec 2004 14:12:41 -0500
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are you sure it is non-corrosive?  put on bare copper with drop of water at
edge of the RTV droplets and wait for few days....Let me know what
happened..
                                        jk

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Roach, David
Sent: Monday, December 20, 2004 11:41 AM
To: [log in to unmask]
Subject: Re: [TN] RTV potting materials


Thanks, Phil.  What we currently use is not acetic acid based, and supposed
to be safe (non-corrosive) for circuit boards.  It still has an odor,
though, due to the alcohol base.  I will check into the Dow 737.


Dave Roach
Trane GCC
4833 White Bear Parkway
St. Paul, Minnesota  55110
651-407-4294

-----Original Message-----
From: Phil Nutting [mailto:[log in to unmask]]
Sent: Monday, December 20, 2004 10:25 AM
To: TechNet E-Mail Forum; Roach, David
Subject: RE: [TN] RTV potting materials

Dave,

We currently use Dow Corning 737 Neutral cure RTV for bonding many large
components, capacitors, inductors, etc., to circuit boards and chassis
parts.

The acetal cure of many RTVs stinks, but more importantly is the fact
that it creates acetic acid as it cures which can etch bare copper...
that could be bad.  The neutral cure stuff has little of no discernable
odor.

I'm sure GE makes a competitive product.

Phil

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Roach, David
Sent: Monday, December 20, 2004 11:15 AM
To: [log in to unmask]
Subject: Re: [TN] RTV potting materials

We currently use an alcohol-based RTV silicone (Dow 3145) to adhere some
tall through-hole capacitors to the PCB to improve vibration resistance.
Is
anyone aware of any water-based RTV silicones that are PCB firendly that
would work as well and not have the odor while curing?

Dave Roach
Trane Controls
St. Paul, Minnesota

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