On 03/28/2013 06:51 PM, Michael A. Terrell wrote:

jim beam wrote:

that's bogus. unless there's been a MAJOR screw-up, potting compounds
are carefully matched to the thermal and chemical application - they
serve to increase reliability, not degrade it.


How many deigns have you selected the proper potting compounds for?
What types of filler materials? How did you verify that no moisture
would be trapped inside the potting? Did you verify the temperature
coefficient of very component, the PC board material and the housing?
Test it for extended periods over the entire temperature, humidity and
barometric conditions that it can encounter in service. how about
vibration & impact testing? Or are you just blowing more smoke out your
ass.

wtf is eating your ass tonight? you're right that all those factors are
relevant. that's why i said potting compounds are "carefully matched".

as to moisture, you're attacking a straw man. i specifically didn't
list every possible application detail because it's common knowledge to
anyone doing that work. nobody specifies that any more than mechanical
drawings specify conventional right-hand threading on fasteners. /all/
fasteners are right hand threaded UNLESS left hand is specifically detailed.


--
fact check required