Jeff Liebermann wrote:

The caps in the photo really are solid polymer caps.

http://www.dslreports.com/forum/r19863881-Solid-Polymer-Capacitor-Failure

The caps in the photo really are NOT solid polymer caps.

They're regular Sacon brand conventional wet electrolytics, only
housed in the same kind of packaging normally used for polymer caps.
Even some of the replies in the message thread where that photo is
from mention this. Real polymer caps, except Fujitsu hybrids, don't
have explosion rupture cutouts, unlike the caps in the photo -- notice
the "K" rupture cutout on top of each cap.