These "specs" sound like "down hole" oil/gas drilling temps.

D. A. Douthit
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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 indicate 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 required. Any general inputs on this since we could not find the operating temperature in the TDS of the materials
> 
> Rgds
> 
> Pradeep
> 
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