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October 2006

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Subject:
From:
"Brooks,Bill" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Brooks,Bill
Date:
Fri, 13 Oct 2006 13:32:12 -0700
Content-Type:
text/plain
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text/plain (96 lines)
He may be referring to the surface resistivity of FR4. Safety agencies
specify that the 'creep' distance between high voltage potentials is
measured over the surface of any feature between them.


Bill Brooks
PCB Design Engineer, C.I.D.+
Tel: (760)597-1500 Fax: (760)597-1510
Datron World Communications, Inc.
Vista, California


-----Original Message-----
From: Jeffrey Bush [mailto:[log in to unmask]]
Sent: Friday, October 13, 2006 10:19 AM
To: [log in to unmask]
Subject: Re: [TN] Creep of FR4

I have not heard of any concerns with creep of FR4 and I have not seen
any values documented.  Only on materials with cold-flow characteristics
- unless the terminology escapes me.

Jeffrey Bush
Director, Quality Assurance and Technical Support
VERMONT CIRCUITS INCORPORATED
           76 Technology Drive - POB 1890
              Brattleboro, Vermont 05302
                Voice - 802.257.4571 ext 21
                    Fax - 802.257.0011
                       <http://www.vtcircuits.com/>

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Geoff Layhe of Lamar
Group
Sent: Friday, October 13, 2006 9:03 AM
To: [log in to unmask]
Subject: [TN] Creep of FR4

Does anyone know where I can find values for the creep of FR4?

regards
Geoff Layhe

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