Two years ago, the companies involved in the BioPhorum Operations Group (BPOG) fill–finish community agreed that the quality of elastomer stoppers for vials was causing problems for biopharmaceutical manufacturers. So they deemed it to be a priority for the group. The problem is particularly pronounced for vial stoppers used in legacy products, which may have been on the market for several years. Many such medicines remain valuable for large patient populations. The stoppers used on legacy medicines are manufactured using…