Graham,
It sounds like you are preparing for your baptism by fire.

Looking at your company's web site and your title, I'm not sure if you are getting ready to build a board or design and build to a specification.

Those of us in the down-hole business can't / won't share with you their secret sauce for designing or building boards or tools.  

As said by another "the information is costly and hard won and much is proprietary."

That said; there are some on this BB that do military or space work that may be willing to share information with you.  Not exactly the same but may help you better understand.

Good Luck

Cheers
Donald
 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Graham Collins
Sent: Wednesday, June 04, 2014 2:19 PM
To: [log in to unmask]
Subject: [TN] high temp environment

Hello Technet!
We are discussing an opportunity with a customer who is looking at placing an instrument down-hole in an oil well, hence a high temp environment.  Are there any good resources around to help me with this one?  Obviously I need high temp solder (Sn96Ag4?), the components will have to be carefully picked, and we will need PWBs that will be OK at high temp (polyimide?).

I've got some homework to do! :-)

--
regards,

Graham Collins
Senior Process Engineer
Sunsel Systems
(902) 444-7867 ext 211


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