Good day...
Our designers want to use an FR-4 material which is designated as
IPC-4101/25.  The /25 material has a permittivity of 4.4, while the other
FR-4 materials (/21and /24) are listed as 5.4.  I found out that GETEK is
classified as /25, and was wondering if this is the only /25 material
available.  Is there a generic (or product) name for the /25 material?  The
slash sheets in 4101 have a maximum permittivity at 1 Mhz, do the graphs
exist that show the Dk at various frequencies?

Jim Marsico
Senior Engineer
Production Engineering
EDO Electronics Systems Group
[log in to unmask] <mailto:[log in to unmask]>
631-595-5879

---------------------------------------------------
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
-----------------------------------------------------