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September 2003

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Subject:
From:
Brian Ellis <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 8 Sep 2003 17:31:00 +0300
Content-Type:
text/plain
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text/plain (92 lines)
Of course silicone will repel liquid water, but we are talking here of
water in a gaseous phase and my experience is that it passes small
molecules, such as water, like a sieve. In the former case, it is a
question of the high surface tension of water, but single molecules, ata
a time, have no surface, therefore no surface tension.

Brian

Misner, Bruce wrote:
> Brian,
>
> This diaphram experiment does not take into account the surface
> wettability of Silicone which is supposed to be one of its major
> protective features (according to Dow) which precludes surface droplets
> from forming. Comments?
>
> Thanks,
> Bruce Misner
>
>     -----Original Message-----
>     From: Steve Gregory [mailto:[log in to unmask]]
>     Sent: Monday, September 08, 2003 8:54 AM
>     To: [log in to unmask]
>     Subject: Re: [TN] Silicone conformal coating
>
>     In a message dated 09/05/2003 2:03:30 AM Central Daylight Time,
>     [log in to unmask] writes:
>
>
>>     I thought I had reported the details of this in
>>     my book, but could not find them today. Must have been somewhere else.
>
>
>
>     Hi Brian!
>
>     It is in your book, on page 329, at the bottom of the section where
>     you talk about Silicone Elastomers.
>
>     In your book you state that you made a diaphram of silicone that was
>     5mm thick, and 100mm in diameter. On one side the air was held at 40
>     degrees C., and 95% RH, the other side at 5% RH. There was 1g of
>     water vapor per day allowed to pass through the silicone diaphram.
>     You stated that is 40 times worse than epoxies, and 20 times worse
>     than polyurethanes.
>
>     Do you have any idea about arcylics?
>
>     Regards,
>
>     -Steve Gregory-
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