Shelf life of Concentrated (unmixed) Star San and PBW

[ArcLight]

Do unmixed Star San or PBW have a shelf life if stored in a dark room with a temperature of 50-60F?

If so - how long are they good for? (In the container).

 

[malkore]

star san...jeez.. years and years?

PBW...i really didn't get to use much of my tub before the humid Nebraska air turned it into a solid block.

 

[Revvy]

Starsan a LOOOOOOONNNNNGGGGGGGG time...unless you are an oak tree, and then it's only a few days. It lasts years unmixed.