The invention relates to a method for loading and storing a vaccine composition, containing the antigen adsorbed on the aluminum adjuvant which (a) comprises (i) loading the composition into a container; and (ii) closing the container with a device in particular acting as a stopper, the surface of the device getting into contact with the composition being coated with a fluoropolymer such as Teflon™ and/or (b) loading the composition into a container wherein the inner surface of which is coated with polymerized silicone. The use of fluoropolymer or polymerized silicone optimizes the adsorbed antigen stability upon storage. In a particular embodiment, the antigen is the hepatitis B surface antigen and the aluminum adjuvant is aluminum oxy hydroxide.