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Flexural Modulus Test

Available as Ready-to-Process Compounds or Masterbatches, New Terraloy® Formulations Provide Physical Properties Comparable to Those of Virgin Polypropylene

PAWTUCKET, RI, U.S.A., December 8, 2010: New blends of thermoplastic starch (TPS) and polypropylene (PP) developed by Teknor Apex Company enable processors to incorporate high levels of both bio-based and recycled content into their products while obtaining physical properties comparable to those of virgin PP, it was announced today by the Bioplastics Division.

The new blends are available in the Terraloy® BP-13020 series of ready-to-process compounds, each with a combined 95% content consisting of TPS and recycled PP; and as Terraloy® MB-13020 masterbatches, which can be let down at a 1:1 ratio in virgin PP for a combined 47% bio-based and recyclate content.

Teknor Apex manufactures the blends using a patented process that incorporates high levels of starch without the usual substantial falloff in the physical properties of the host polymer, noted Edwin Tam, manager of strategic initiatives. “Many processors are looking for ways to help customers meet sustainability goals by incorporating ‘green’ content but are discouraged by the property tradeoffs often involved,” Tam said. “Our Terraloy products can help them meet sustainability goals while still obtaining performance comparable to those of standard polypropylene.”

Teknor Apex recommends the new blends for use in injection molded consumer products, extruded sheet, profiles, and tubing, and blow molded jars and bottles.

Terraloy® BP-13020 ready-to-process compounds are blends of 25 to 30% TPS and 70 to 75% PP, of which 70 to 75% is recyclate. Terraloy® MB-13020 masterbatches have 35 to 50% TPS content and up to 50% recyclate. Customers can use the masterbatches in a 1:1 letdown with either virgin or recycled PP.

Data in the accompanying table show how two Terraloy compounds, based on homopolymer and copolymer PP, respectively, compare with virgin PP in terms of physical properties. Teknor Apex can custom formulate compounds to maximize specific properties such as impact strength or flexural modulus.

PHOTO CAPTION: In this test for measuring flexural modulus, two Terraloy BP-13020 series compounds exhibited values virtually identical to that of copolymer polypropylene and 20% less than that of homopolymer, respectively.


THE BIOPLASTICS DIVISION OF TEKNOR APEX COMPANY is a custom compounder of plastics derived from renewable resources. Products include 100% bioplastic compounds as well as hybrids that combine bioplastic and standard petrochemical-based polymers. The division’s Terraloy™ TPS compounds are based on a patented process that prepares thermoplastic starch (TPS) from starch granules and blends it with other polymers without compromising the performance properties of the host material. Parent company Teknor Apex is one of the world’s leading custom compounders of thermoplastics, including vinyls, elastomers, nylons, and color concentrates. Teknor Apex was established in 1924 and is privately held. Headquartered in Pawtucket, RI, U.S.A., it manufactures in the U.S.A., Singapore, China, and the UK and sells in 90 countries. Visit

FOR MORE INFORMATION: Tel: 1-401-725-8000. Fax: 1-401-724-8520. Email: