Electronic – What are the uses for a water soluble IC socket


I recently stumbled across water soluble IC sockets after being given a bag of them. While they do dissolve successfully from the board, I can't seem to come up for a valid explanation for why anyone would ever want to specifically spec out water soluble IC sockets for their project. What are their intended purpose(s)?

For reference, it does appear Digi-Key sells one model of these however the page and reference sheet provide no clues as to its intended use.

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