From Certified Thermoplastics Co., Inc.'s website:
Custom Extruded Profiles Of Engineering Thermoplastics, extruded plastics, Carbon & Glass Reinforcements, Conductives, & Filled Thermoplastics; Production, Prototyping & Short Runs; MIL-I-45208A With Statistical Process Controls; Engineering & Materials Assistance Available. No Proprietary Products, All Extrusions Made To Order.
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Extrusion includes the manufacture of lengths of cross-sectional shapes and profiles. Extruded products are available in a wide variety of materials and material combinations.
Profiles and structural shapes include shaped stock with uniform cross sections such tees, angles or beams manufactured through extrusion, continuous casting, roll forming, and other processes.