We have been specifying a minimum Tg of 170 deg C lately on all of our
boards, and most shops have been supplying Tg of 180 deg C as a standard
value. 

I don't know how much I can say about our product to be able to give
more information. I was asked this morning if the board material we
specify was adequate for this environment.
It looks like we will  be OK.

Thanks,
Don

-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of
Brooks,Bill
Sent: Thursday, April 21, 2005 5:01 PM
To: [log in to unmask]
Subject: Re: [DC] High Temperature Environment

Dennis,

That seems to be a great choice based on the limited information
supplied...

If more margin is needed for unknowns you could try the FR406
IPC-4101/26
which has a minimum Tg of 170 deg C

http://www.isola-usa.com/images/uploaded/FR406Bulletin-1.pdf

FR408 IPC-4101/24 has a minimum Tg of 150 deg C although ISOLA brand
material claims 180 deg C. But I am basing that off the IPC-4101 spec.

http://www.isola-usa.com/images/uploaded/FR408Bulletin2.pdf

I would specify the IPC-4101 spec because that is not vendor specific.


Bill Brooks - KG6VVP
PCB Design Engineer, C.I.D.+, C.I.I.
Tel: (760)597-1500 Ext 3772 Fax: (760)597-1510
_______________________________________
Member of the San Diego Chapter of the IPC Designers Council
Communications Officer, Web Manager
http://dcchapters.ipc.org/SanDiego/
http://pcbwizards.com

-----Original Message-----
From: Denis Lefebvre [mailto:[log in to unmask]]
Sent: Thursday, April 21, 2005 1:19 PM
To: [log in to unmask]
Subject: Re: [DC] High Temperature Environment

I think I'd be inclined to go with FR408 or any IPC4101/24 grade
material.

-----Original Message-----
From: Don Larisey [mailto:[log in to unmask]]
Sent: Thursday, April 21, 2005 1:13 PM
To: [log in to unmask]
Subject: [DC] High Temperature Environment


We are looking at putting a small board with all components rated to
125C into a sustained working environment of 120C. Should we be
specifying a different board material other than FR4. This is a small
double sided board about 25mm X 40mm with components both sides.



Any comments???



Don

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