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| Date: | Fri, 12 May 2017 16:36:38 +0200 |
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FR5 is the high temperature version of FR4 epoxy laminate with glass fiber
reinforcement. FR5 laminate uses multiple layers of woven glass cloth
impregnated with a poly-functional epoxy resin system which provides greater
mechanical stability and heat resistance. Expansion coefficient of FR5
laminate in the xy plane is approximately 14 ppm/XC (25XC to 130XC). The
expansion coefficient of epoxy resin in the z axis is approximately 4% at a
range of 50XC to 288XC. The glass transition temperature (Tg) of FR5 is
typically between 170-180oC. Continuous operating temperature for FR5 is
typically 140XC. High Tg laminate is best suitable for multilayer PCB with
higher layer count. Automotive producers also considered FR5 glass epoxy
laminate to be the best material due to its improved Tg glass transition
temperature for automotive applications.
Ulisse
-----Messaggio originale-----
Da: TechNet [mailto:[log in to unmask]] Per conto di Dwight Mattix
Inviato: venerdě 12 maggio 2017 16:16
A: [log in to unmask]
Oggetto: Re: [TN] FR-4 vs. FR-5
FR-4 describes a class of standard temp laminate treated with di-functional
epoxy. It has become a catch all phrase that is used (even by me) rather
imprecisely for materials beyond it's orginal, technical description.
As you move up the laminate family curve in temp/Tg,you enter (and pass
through) the land of multifunctional epoxies classified as FR-5.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Richard Krug
Sent: Friday, May 12, 2017 4:52 AM
To: [log in to unmask]
Subject: [TN] FR-4 vs. FR-5
We've recently started the NPI process for a new assembly using FR-5
laminate. A week ago I'd never heard of FR-5 and don't know much about it.
Does anyone have experience with FR-5?
Sources of laminate?
Key differences from FR-4?
Then for my information, what would be the driver to specify this material?
Any input on sources should be offline. Thanks in advance.
Dick Krug, CSSBB, CSMTPE
Lead Process Engineer
Sparton Brooksville, LLC
30167 Power Line Road
Brooksville, FL 34602-8299
(352) 540-4012
[log in to unmask]
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