Batch drying allows closure of all

Batch drying allows closure of all vials in a lot at the
same time, under the same atmospheric conditions. The
vials can be stoppered in a vacuum, or after backfilling
with inert gas. Stoppering of all vials at the same time
ensures a uniform environment in each vial and uniform
product stability during storage. Batch drying is used to
prepare large numbers of ampules or vials of one
product.