FR4 in oil

[John Devereux]

Hi,

Does anyone have any experience of the effect on FR4 of being submerged
in oil? By this I mean mineral oil (and hydraulic fluids in
general). Will be subject to typical hydraulic pressures and
temperatures.

I need to mount a small SMT sensor.

How about other substrates, e.g. aluminum PCB, never used it but my
supplier advertises the capability.

 

[Gerhard Hoffmann]

Am 29.10.2010 16:00, schrieb John Devereux:

Does anyone have any experience of the effect on FR4 of being submerged
in oil? By this I mean mineral oil (and hydraulic fluids in
general). Will be subject to typical hydraulic pressures and
temperatures.

I need to mount a small SMT sensor.

How about other substrates, e.g. aluminum PCB, never used it but my
supplier advertises the capability.

FR4 will soak hydrocarbons and it will grow.
DOn't know if it will harm a single sensor.

We used Kapton for 16-layer boards to be deployed in ultrasonic
pipeline pigs. 1024 ultrasonic channels in a thing that looks
like a torpedo. Was quite costly and the prepregs have a
short shelf life. (danger of delamination)

\Gerhard

 

[PeterD]

Hi,

Does anyone have any experience of the effect on FR4 of being submerged
in oil? By this I mean mineral oil (and hydraulic fluids in
general). Will be subject to typical hydraulic pressures and
temperatures.

There is not much of a typical pressure and temperature... Can you be
more precise? Hydraulic pressures 'typically' run from a few hundreds
of PSI to many thousands of PSI. Temps can run from just above ambient
to 350 degrees (F).

 

[John Devereux]

There is not much of a typical pressure and temperature... Can you be
more precise? Hydraulic pressures 'typically' run from a few hundreds
of PSI to many thousands of PSI. Temps can run from just above ambient
to 350 degrees (F).

It would vary with the application, but say up to 400 bar, and 85'C.