Yes, all the below.  It takes amazingly little (molecules) to start
impacting adhesion and soldering performance.  It migrates easily with
contaminated hands.  We have special ovens to handle assy containing RTV
to prevent cross-contamination. It's difficult to quantify the threshold
of impact.  We have used silicone-based Kapton tape adhesive with no
impact, but plater's tape (the pink stuff) has much more free silicone
and causes loss of epoxy adhesion in the area the tape was applied.

> Rainer G. Blomberg
> Honeywell -Space Systems Clearwater
> Staff Production Engineer
(727) 539-5534


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Blair Hogg
Sent: Monday, November 12, 2007 12:10 PM
To: [log in to unmask]
Subject: Re: [TN] Silicone Lens Cleaner Problem

Is it just liquid silicone, like that found in lens cleaner, that we
should be concerned about? What about silicone found in the thermal pads
and the elastomeric keypads? How abou tsilicone based RTV materials?

Blair

On Mon, 12 Nov 2007 18:49:11 +0200, Brian Ellis <[log in to unmask]>
wrote:

>... or permit adhesives, solder masks, conformal coatings to bond with 
>their substrates.
>
>Brian
>
>John Burke wrote:
>> Yes it is a non stick surface which will completely negate all
attempts to
>> solder to any surface that has come into contact with it.....8-)
>>
>> John
>>
>>
>>
>> John Burke
>>
>> (408) 515 4992
>>
>> -----Original Message-----
>> From: TechNet [mailto:[log in to unmask]] On Behalf Of Blair Hogg
>> Sent: Monday, November 12, 2007 8:14 AM
>> To: [log in to unmask]
>> Subject: [TN] Silicone Lens Cleaner Problem
>>
>> I'm hoping that somenone on TechNet this morning can help my 
>> understand a little more about this. I received a letter from a
customer
>> stating that silicone can introduce contaminants which are
detrimental
>> to the manufacturing process.  The notice specifically mentioned lens

>> cleaner.
>>
>> Can someone enlighten me as to what problems silicone can cause?
>>
>> Thanks,
>>
>> Blair
>>
>> ---------------------------------------------------

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