Teflon capacitor duration

[Zak28]

whats the shelf life for teflon dielectric capacitors?

these appear to be a decent deal but they are NOS and might be far off their spec

http://www.sovtube.com/ceramic/59-fgt-i-005uf-8kv.html

[marce]

8000Vs and rather large, do you need such a high voltage?

[Zak28]

8000Vs and rather large, do you need such a high voltage?

Those caps are likely damaged due to improper storage conditions and it seems highly unlikely they will perform anywere near their claimed specs.

[Nik_2213]

As they're not electrolytic, that's one possible failure mode side-stepped.

But, IMHO, if you're playing with such voltages, don't risk it. Buy the 'good stuff', and install with due care lest the 'magic smoke' escape...