>I do not discount low temperature ranges--what I discount is the combination
>of low and high temperatures in the same test cycles. This confounds a number
>of different damage mechanisms.
>Sure, cycling assemblies from -55 (or -65) to +125 (or +150) C will give you
>failures fast, but so does dropping them from the Empire State building.
> What do these cycles mean for your product that never sees any cycles even
>remotely close to the test cycles? 

   < snip >

Werner, just a point of reference, we perform a lot of thermocycling test
cycles with both low and high thermal excursions (ie -40 to +125 etc). I
would just like to say that for certain automotive applications (ie under
hood), a thermal excursion of -40 to +125 is not merely feasible, it is
almost certain. Those in doubt merely have to check the temperature here in
Montreal today.

Dave Rooke
Circo Craft - Pointe Claire

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