We cannot be sure that St Paul is here referring to purgatory; but it is quite in order to interpret “he will be saved, but only as through fire” in that sense.

– Navarre Bible, Saint Paul’s letters to the Corinthians, p. 47 (2005)

The Navarre Bible is a production of Opus Dei and features commentary compiled by the faculty of the University of Navarre. It’s not necessarily more or less official than some of the competing study bibles.