standard techniques as indicated above while not intended to be so limited the process of the present invention will be described in its application to the molding and filling of vaginal contraceptives of the general type taught in the above mentioned u s pat nos 4 198 976 and 4 200 090 an exemplary contraceptive device of the type contemplated is illustrated in fig1 and is generally indicated at 1 the contraceptive device comprises a container made of a non porous resilient elastomer substantially impervious to liquid water the container is made up of a front or inner half 2 and a rear or outer half 3 the container is substantially filled with an aqueous solution of a spermicidal surfactant 4 the inner part 2 has a thin membrane portion 2a having a thickness of from about 0 254 mm to about 0 508 mm about 0 01 to about 0 02 inches as indicated above the membrane portion 2a is such that surfactant micelles cannot diffuse therethrough while surfactant monomers are free to dissolve in the membrane material and diffuse therethrough although the outer part 3 may be made of a different elastomer impervious to diffusion of surfactant monomer molecules for ease in sealing it is preferred that it be made of the.