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December 2003

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Subject:
Re: Parylene Piercing Press-fit Connectors...
From:
"Barr, Bob" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 11 Dec 2003 12:05:19 -0500
Content-Type:
text/plain
Parts/Attachments:
text/plain (52 lines) 
Dave,

On PCB's, thickness is typically .001" or less. The J-Std-001 limit for
Parylene (Type XY) is .000394"-.00197" (Table 10-1). Thickness is very well
controlled by how long the board is in the chamber. It is the only coating
that is truly "conforming". As far as effective protection, I don't believe
there is anything better, primarily because of its conforming nature, high
dielectric strength and the fact that it goes everywhere since it is vacuum
deposited. It was the only coating we used on boards going into satellites
when I was in that business. As to your other questions, I will have to
defer them to someone who is more knowledgeable with the chemistry of the
product.

=========================
Bob Barr
Manufacturing Engineering
Formation, Inc.
=========================

> -----Original Message-----
> From: David Douthit [mailto:[log in to unmask]]
> Sent: Thursday, December 11, 2003 11:59 AM
> To: TechNet E-Mail Forum.; Barr, Bob
> Subject: Re: [TN] Parylene Piercing Press-fit Connectors...
>
>
> Bob,
>
> How thin is "thin"?
>
> At what point would the thickness of the parylene begin to
> pose problems?
>
> Is this "thin" parylene effectively protecting the circuitry?
>
> What tests are needed to determine if there are problems?
>
> David A. Douthit
> Manager
> LoCan LLC
>

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