Answer
For Havrix Monodose hepatitis A vaccine, the syringe tip cap, plunger stopper and vial stopper are made with synthetic rubber, with the plunger and vial stoppers specified as butyl rubber.
Sources for this answer
- Havrix Monodose VaccineGlaxoSmithKline UK · emc · SmPC §6.5 Nature and contents of container · Version 24Document updated
Sources checked