If the device is part of a system certified to UL requirements, wouldn't the UL Maximum Operating Temperature for the board come into the consideration?  That includes laminates for sure.  Solder masks and conformal coatings are certified to flame resistance, but not sure about maximum operating temperature.  

Denny Fritz



-----Original Message-----
From: David Douthit <[log in to unmask]>
To: TechNet <[log in to unmask]>
Sent: Thu, May 9, 2013 10:03 am
Subject: Re: [TN] Operating temperatures


These "specs" sound like "down hole" oil/gas drilling temps.
D. A. Douthit
-----------------------------------
On May 9, 2013, at 4:09 AM, Pradeep Menon wrote:
> We have a requirement specified in the master drawing of couple of PCBs which 
ndicate that the operating temperatures as below.
 
 1.            -50°C to 200°C operating PCB.
 2.            -40° to 150°C operating PCB.
 
 Will a high Tg material FR4 meet this requirement. Or will Polyimide be 
equired. Any general inputs on this since we could not find the operating 
emperature in the TDS of the materials
 
 Rgds
 
 Pradeep
 
 ______________________________________________________________________
 This email has been scanned by the Symantec Email Security.cloud service.
 For more information please contact helpdesk at x2960 or [log in to unmask] 
 ______________________________________________________________________
______________________________________________________________________
his email has been scanned by the Symantec Email Security.cloud service.
or more information please contact helpdesk at x2960 or [log in to unmask] 
_____________________________________________________________________


______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________