Spartech Plastics is one of the largest extruders of custom thermoplastic sheets and rollstocks in the world. It offers a range of products, including packaging, graphic arts, general purpose and specialty sheets. The company specializes in multilayer sheets that are utilized for creating packaging containers used in aseptic, fill and retort packaging applications. It manufactures rigid plastic sheets in of a variety materials, including polystyrene, high-and low-density polyethylene and polypropylene. Spartech Plastics also provides a variety of print-grade sheets and rollstock materials that are formulated for use in graphic arts applications, such as motion and lenticular products, retail and non-promotional signs, horticultural stakes, cards and consumer goods packaging. The company has received an ISO 9000/ISO 14001 certification from the International Organization for Standardization. It is a subsidiary of Spartech Corporation, which is one of the leading producers of custom-engineered plastic products in the United States. Headquartered in Clayton, Mo., it maintains a location in Wichita, Kan.