FR4 is standard epoxy, where FR5 is modified for Hot-Strength-Retention
and is more suited for higher operating temperatures.  It was developed
due to the issues/costs with processing BT and Polyimide years ago.
Avionics used it quite a bit and it was a plug in for MIL shops as your
qual for FR4 extended to FR5 and it processed very similar.  With all
the advancements in materials over the past 20 years it has been reduced
in use - mainly we see it only on older drawings that cannot be updated
because no $$$ exists in the contract to implement updates.

Jeffrey Bush
Director, Quality Assurance and Technical Support

VERMONT CIRCUITS INCORPORATED
  76 Technology Drive - POB 1890
    Brattleboro, Vermont 05302
      Voice: 802.257.4571.21 Fax: 802.257.0011
           http://www.vtcircuits.com
 

-----Original Message-----
From: Baski Devre [mailto:[log in to unmask]] 
Sent: Thursday, May 19, 2005 6:41 AM
To: [log in to unmask]
Subject: [TN] FR5

Hello Technetters

Do you know the differences between FR4,FR5 and CEM3. What does FR5
mean?
what are its properties. Can you advice me any web adrdress or data
sheet of
FR5 to compare it FR4 and CEM3?
Thank you for your incomming suggestions

Yusuf GOMEC
Product Quality Engineer


BASKI DEVRE SAN. ve TIC. LTD. STI.
Ceyhan Sk. No:10 81490 Pendik-Istanbul-Turkey
Tel:0090 216 3901036(4 Line)/4836560(4 Line)
Fax:0090 216 3544941/4913269
Gsm:0090 533 6579897/7480014
Internet: www.baskidevre.com.tr

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