Our 19th and 20th century photographs and negatives are being digitized and archivally rehoused, in boxes with paper or archival poly enclosures. The shelves they are stored on are in a room with sprinkler heads in the ceiling. I was thinking of covering the shelves with plastic sheeting, in case the sprinklers went off; but should I be concerned about harmful offgassing of pvc which would affect the photos/negatives?

Thanks -

Dana Gee