Good Day To All,

Back in April I posted some queries on the tech-net about high voltage
testing after 85C/85RH testing and was basically told this test was
impossible and I agree with that assessment. But some things have a life of
their own.

To re-iterate: We are building a 4 layer flex circuit. All layers are 18
micron copper and all lines and spaces assuming perfect etch are 100 micron
lines and 100 micron spaces. My customer for some reason signed up to pass a
250 volt test after 1000 hours of 85C/85RH damp heat test. My premise is
being in this case a polyimide build if they dried the circuit after this
test it should pass. They do not want to dry it and still have it pass. 

The previous threads in summary said this test was "madness" - I agree but
what is the scientific explanation of why this is madness. 

Please note this requirement is being driven by very large telecom companies
and the worlds largest provider of internet gear. 

Thanks again for the help.

Regards Steve Kelly

 

Steve Kelly

(416) 750-8433 (work)

(416) 750-0016 (fax)

(416) 577-8433 (cell)

 


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