Profile: Middlefield Plastics, Inc. specializes in extrusion. Our extrusion materials include rigid PVC, flexible PVC, nylon, polyethylene, polypropylene, polystyrene and polybutyrate. We serve industries such as telecommunication, windows & doors, water treatment, marine and office products. We are capable in streamlining and dual durometer extruding. We specialize in in-house engineering and design assistance with the latest CAD systems.