Systems and methods are disclosed in which a seal is formed between an interior of an airbag inflator base and an exterior environment. A polymeric member of a membrane seal can form a solid state bond with an overmold of an electrical connector of an initiator of an airbag inflator. Furthermore, an adhesive film of the membrane seal can bond to the airbag inflator base at a position disposed at least partially around a recess through which the overmold couples an initiator to the airbag inflator base.