Electrolytic cap endurance

[Perry Babin]

From what I've found, the endurance of a liquid electrolytic cap is determined by the loss of electrolyte. If a cap is rated for 1000 hours. That's typically for a straight run test. How would the life vary if the cap is intermittently heated to its rated temperature (105C). Maybe for an hour at a time then cooled back to 30-40C (just a random number). Would the life still be 1000 hours?

Does it make a difference in the life expectancy if the cap is heating from ripple current (internal heating) instead of from the external ambient temperature?

Why do polymer capacitors have a rating for endurance. Does the solid electrolyte deteriorate over time?

[eccerr0r]

The rating is 1000 hours at 105°C continuous. I don't think it matters if that 1000 hours is broken up, but any hours at 95°C also counts against that 1000 hours as well as hours spent at 30°C though much less than that at 95°C. Plus this is all statistical, so there's no guarantee they will fail at exactly 1000 hours at 105°C.

Ripple current induced heating is likely more of a concern as there's no thermal insulation from the source of the heat - it's heating itself.