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Date: | Tue, 10 Sep 1996 09:59:08 -0500 |
Content-Type: | text/plain |
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At 08:47 AM 9/9/96 EDT, you wrote:
> I was wondering if someone has some information on the environmental impact
>of the parylene process. Are there any emissions evolved and if so what are
>their typical concentrations? I realize that some parylene may get trapped
>in the cold trap and will have to be disposed of by landfill. How much waste
>is generated per cycle?
> Also, I am told that substrates for parylene coating are first washed with
>de-ionized water and then treated with an adhesion enhancing solution. In
>SCS's literature the enhancer is a gas while most companies use a liquid
>enhancer. Are there any advantages/disadvantages with using either one?
> Is humidity a problem for parylene? Can humidty get trapped between the
>coating and the board which would cause corrosion?
>
> My thanks in advance.
>
>Reply:
>Per Ben Guthrie, an engineer in our area very familiar with Parylene:
Parylene is an excellent moisture barrier. Also, because it is applied using
a vacuum deposition process,
moisture under the parylene is not likely. A pre-bake would take care of any
such concerns.
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----------------------------------
Jeffery L. Hempton Phone: (219) 429-7335 Fax: (219) 429-4688
Hughes Defense Communications Mail Stop: 25-31
1010 Production Road, Fort Wayne, IN 46808-4106
Email: [log in to unmask]
"The reason most people do not recognize opportunity is because it is
usually wearing a pair of bib overalls and disquised as hard work." -
-Thomas Edison
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