Werner:
Suggest you recheck with Nelco on the Y-axis CTE.  It appears to me that the value should be around 14.9 not 4.9.  I don't know of any epoxy based laminate with conventionally reinforced glass fabric that has such a low in-plane CTE.  If 4.9 were valid, it would have changed all of our developmental efforts back in the late 80's when LCCC were touted the next BIG deal, and we suppliers were assigned the responsibility to develop laminates to resolve the ceramic-vs-laminate mismatch (from which came exotics like quartz, aramid, etc reinforcements, and compliant layer substrates, and CIC metal cores.)
Jim Paulus

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Werner Engelmaier
Sent: Friday, October 01, 2004 7:48 AM
To: [log in to unmask]
Subject: Re: [TN] 2nd Nelco4000-13

Thanks for the help,
I received the information I need direct from Nelco; and I want to share it.
 N4000-13

X axis CTE (-40 to +125C.)
 16.9 ppm/°C

Y axis CTE (-40 to +125C.)
 4.9 ppm/°C

Z axis CTE (below Tg)
 69ppm/°C

Z axis CTE (above Tg)
 283ppm/°C

What is interesting is the large anisotropy between x and y. That sure makes 
an alternating lay-up scheme important.

Regards,
Werner Engelmaier

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
-----------------------------------------------------

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
-----------------------------------------------------