I've used Nelco's (-13) as an alternate to Getek. Allied Signal's (now Isola)
FR408 is another alternative .
thanks,

On 25 Feb 2004 at 10:41, Marsico, James wrote:

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

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