Is it going into an oil well?
I'm not sure that FR-4 wouldn't work , since FR-4 is sometimes subjected to
hot oil reflow, where the plated tin-lead is reflowed in a bath of hot oil.
The process I've seen used 400-420 °F for 20 seconds. I'm not sure what the
composition of that oil (WS-250) is, but it came from Florida Cirtech. FR-4
has higher peel strengths than most materials (polyimide, Teflon, etc., so
that's a plus). It might be reasonable to conformally coat the board with
something resistant to the oil, perhaps parylene or urethane (others on
Technet can say more about this or correct me). I don't think the pressure
is an issue as far as the substrate goes, since it will be a hydrostatic
pressure and won't subject the board to tensile, bending or shearing
stresses.
Tim Reeves

> ----------
> From:         Geoff Layhe
> Sent:         Wednesday, December 1, 1999 9:00 AM
> Subject:      laminate in hot oil
> 
> Here's a strange request,
> 
> I,ve been asked to specify a copper clad laminate for a circuit board
> which will be immersed in hot oil (80ºC) at 3000psi pressure. Anybody
> got any ideas?
> 
> Geoff Layhe
> 
> www.lamar-uk.co.uk
> 

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