a continuous process provides a devolatilized liquid injection moldable silicone composition . in the process , a filler , treating agent and silicone polymer are introduced into an extruder having a length to diameter ratio of at least greater than 50 . the filler , treating agent and silicone elastomer are continuously compounded in the extruder into a devolatilized liquid injection moldable silicone composition . a system for preparing a liquid silicone rubber composition comprises a mixer to prepare a concentrate of filler and silicone polymer , a long extruder having an l / d ratio of greater than 50 , connected to the mixer to receive the concentrate from the mixer and to compound and devolatilize the concentrate , a treating agent and silicone polymer into a liquid silicone rubber composition containing volatiles and a cooler to receive the liquid silicone rubber composition to cool , homogenize and further devolatilized the composition .