Unfilled TPOs for Large Thermoformed Parts

A new series of colorable, unfilled TPOs designed for large-part thermoforming boast an excellent balance of melt flow, melt strength, and drawability.

A new series of colorable, unfilled TPOs designed for large-part thermoforming boast an excellent balance of melt flow, melt strength, and drawability. They were developed by Transmit Technology Group, LLC, Irving, Texas, which provides contract R&D services for new materials and applications development. The proprietary formulations are available through licensing to compounders and thermoformers of automotive seating, large containers, and appliance housings. One early licensee is Doskocil Manufacturing Co., Inc., Arlington, Texas, a large-part thermoformer whose subsidiary, Spectrum Polymers of Mansfield, Texas, will compound the TPOs.


Available in 1 to 3 MFR, these TPOs are made by a reactive extrusion process without peroxides that can cause yellowing and odor problems. Moreover, these unfilled TPOs have lower density (0.91 g/cc) than talc-filled thermoformable TPOs, plus exceptional impact strength—notched Izod of 6 to 11 ft-lb/in. and ductile failure at -30 C. They also have adjustable gloss and flexural moduli of 90,000 to 180,000 psi. They do not require drying, cost less than nucleated TPOs, and allow incorporation of more trim scrap, says Transmit Technology. Independent lab tests are said to indicate better oven sag resistance at 170 C than typical TPOs. Trasmit Technology: (972) 870-9988/www.transmit-technology.com • Spectrum Polymers: (817) 473-7242/PTDirect: 929ZP