Vial filling and stoppering (revision 2)
Old revision·04:14, 1 Nov 2024·SortKeySascha
| Vial filling and stoppering | |
|---|---|
| Determines | Fill mass, headspace, container integrity |
| Sequence for lyophilisate | Fill, partially stopper, dry, seat, cap |
| Failure mode of interest | Underfill; seal defects |
| Analytical method infobox · conventions | |
Vial filling and stoppering is the operation that transfers material into its final container and closes it. For a lyophilised product the sequence is distinctive: solution is filled, stoppers are seated only partially so that vapour can escape, the vials are dried in the chamber, and the stoppers are then pressed home before the vials leave it.[1]
Two attributes are set here and nowhere else. Fill mass determines how much material a purchaser receives — see Underfilling — and container closure integrity determines whether the contents stay dry and uncontaminated for the shelf life.[2]
Fill control
[edit]Filling is volumetric or gravimetric. Volumetric filling meters a volume and relies on solution density; gravimetric filling weighs, in-process or in a sampling plan, and is more directly connected to the quantity of interest.[1]
Fill accuracy is specified as a tolerance and monitored during the run, since pump and valve behaviour drifts, and the in-process records are part of the batch documentation.[3] A deliberate overage above the label claim is ordinary and compensates for losses in reconstitution and withdrawal; it is not a defect. See Underfilling.