How long does Gap-pad material last before breaking down significantly?

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treez

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Hello,
We wish to use “Gap pad 1500” (Page 17 of the below link) to gap-pad our SMT FETs to a heatsink which is above the PCB.
https://www.bergquistcompany.com/pdfs/selectorGuides/TIM SG_0115_WEB.pdf

…the datasheet says nothing of the longevity of this gap-pad. How long would it last in our enclosure which is at 70degC ambient? When will the gap-pad material significantly break down? (go hard and just flake away under vibration of the unit)
 

The rubber seems to be rated -60 +200 *C, so 70*C should not be a problem. I have some silicone rubber sleeving that has been in my workshop for the best part of 50 years and it as good as new. The adhesive does show some ageing effect, but I guess once the pad is under compression from the device, that should not be important.
I do not think its a problem, why not phone the manufacturers up for clarification?
Frank
 
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