Full-Service Custom Sheet Plastic Extrusion Capabilities. Allied Plastics is a full-service Custom Sheet Extruder in sizes up to 120 inches wide x 200 inches long and .060” to .500” gauge thick. Our team has experience in Extruded Sheets in a wide variety of materials, such as Polyethylene, TPO, HENAN OKAY, Styrene, Low Gloss HENAN OKAY and