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July 2010

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Subject:
From:
Syed Ahmad <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Syed Ahmad <[log in to unmask]>
Date:
Tue, 27 Jul 2010 12:05:28 -0500
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text/plain
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text/plain (115 lines)
Moisture absorption wt %
Most of the data is from Electronic pkgg materials and their properties by
Pecht et al.

Acrylic 6
Epoxy 4
Polyimide/polyamide 3
Kevlar-49 0.5-2, 1.1
Polyester <0.8, 2PPA 1.8
Polyvinyl Chloride <0.5
Polycarbonate <0.35
BCB 0.25
Polysulfone <0.22
FR4 0.1
Parylene <0.1
Fluoropolymers 0.1
Cyanate ester 0.08
BT 0.05
Polyvinyl fluoride <0.05
LCP 0.02, 0.04
TFE/FEP/polyethylene <0.01
Polypropylene <0.005

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dan Skweres
Sent: Monday, July 26, 2010 2:25 PM
To: [log in to unmask]
Subject: Re: [TN] Non-Hygroscopic" flex circuit material

Ken,
A material that doesn't absorb moisture from the environment. Kapton is out.

:)
Dan S.
----- Original Message -----
From: "Kenneth Wood" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, July 26, 2010 3:01 PM
Subject: [TN] Non-Hygroscopic" flex circuit material


Hi all.
What would you consider a "Non-Hygroscopic" flex circuit material to be?
Thanks
Ken

_____________________________________
Kenneth J. Wood
Saturn PCB Design, Inc.
www.saturnpcb.com









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