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July 2009

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Subject:
From:
Ken Bloomquist <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Ken Bloomquist <[log in to unmask]>
Date:
Tue, 14 Jul 2009 13:56:46 -0800
Content-Type:
text/plain
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text/plain (59 lines)
Hi Steve,

I wonder if there is any way these could be parylene coated after assembly.
That should extend their shelf life quite nicely.

KennyB

-----Original Message-----
From: Steve Kelly [mailto:[log in to unmask]]
Sent: Tuesday, July 14, 2009 2:12 PM
To: [log in to unmask]
Subject: Re: [TN] Storage life for rigid flex

Hi Inge,
Thank you - good common sense. I can work with this. Regards Steve

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge
Sent: July-14-09 5:08 PM
To: [log in to unmask]
Subject: Re: [TN] Storage life for rigid flex

Steve,
I think there would be no problem with the storage in itself, however, what
happens when the part is to be used after 20 years. It might depend, as a
certain person use to say, parts are used differently. A part that is
vibrating or is part of moving function will react to small changes more
than a 'stiff' one. I have seen flexes with sharp bends delaminate after
long use. On the other side, non movable and fixed flexes in e.g. cameras
seem to live for ever. And finally an example from a copiator used in one of

our vehicles for 'desert' use. The machines had been half filled by sand,
had been frequently used and under awful conditions. There was absolutely
no problem with the large flex that operates the head. So, PI is very tough.

The answer to your question is probably dependant of the application.
Interesting case, I recognise your situation. Missiles, grenades and a lot
of other mil stuff is often stored for many years, and are supposed to work
instantly despite the long storage time. In such cases, there will be little

wear with operational time only seconds or minutes and hence no problems. I

suppose you get the best information from the PI manufacturers themselves.
Would be surprised if someone at TN can give a real safe answer to your q.
Good Luck. Who seekest will find.
/Inge



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