[SI-LIST] AW: FR4 permittivity
- From: "Havermann, Gert" <Gert.Havermann@xxxxxxxxxxx>
- To: "cyril.chastang@xxxxxxxxxxxxxxx" <cyril.chastang@xxxxxxxxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Thu, 21 Feb 2013 12:43:37 +0000
I couldn't open the immage, but the number is wrong. FR-370 has a dk of approx.
4.0. Maybe this test was UL flammability test on the pure resin without Glass?
BR
Gert
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-----Ursprüngliche Nachricht-----
Von: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] Im
Auftrag von CHASTANG Cyril
Gesendet: Donnerstag, 21. Februar 2013 13:23
An: si-list@xxxxxxxxxxxxx
Betreff: [SI-LIST] FR4 permittivity
Hi,
I have recently received a PCB (dielectric= Isola PLC-FR-370HR) and its
certificate of compliance (extract below). The value of the material
permittivity given below is quite surprising (2.173) to be FR4. Is it the
effective permittivity for a microstrip? Is there a mistake in the certificate?
[cid:image001.png@01CE1035.1EA257F0]
Have you ever seen a FR4 permittivity like that ?
Thank you for your help.
Cyril
[@@ THALES GROUP INTERNAL @@]
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