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ASTM Standard addresses thermoplastic elastomer testing.

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September 29, 2010 - Developed by Subcommittee D11.12 on Processability Tests, ASTM D7605 will provide effective way to test production lots of thermoplastic elastomers to quantify and predict how well they process and what ultimate physical properties will be imparted to final molded or extruded products. According to John Dick, a D11 member, standard relates to subtle variations in molecular changes such as rubber-to-plastic resin ratios, curative concentration for dynamic vulcanization, and DV temperature.

Elastomer Testing is Subject of New Standard from ASTM Rubber Committee


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Press release date: September 21, 2010

W. CONSHOHOCKEN, Pa., - A new ASTM International standard will provide a fast and effective way to test production lots of thermoplastic elastomers in order to quantify and predict how well they process and what ultimate physical properties will be imparted to final molded or extruded products. ASTM D7605, Test Method for Thermoplastic Elastomers - Measurement of Polymer Melt Rheological Properties and Congealed Dynamic Properties Using Rotorless Shear Rheometers, was developed by Subcommittee D11.12 on Processability Tests, part of ASTM International Committee D11 on Rubber. According to John Dick, senior engineer, applications, Alpha Technologies and a D11 member, the new standard will quantify lot- to-lot variations in the plant receiving area that relate to quality variations. "This standard can be used in plant quality problem-solving situations," says Dick. "It has the practical advantage of relating to subtle variation in molecular changes that traditional methods cannot detect, let alone determine why this performance variation is occurring." These variations include rubber-to-plastic resin ratios, curative concentration for dynamic vulcanization, DV temperature, quality of the rubber itself, concentration or type of oil and filler and resin effects. Subcommittee D11.12 is currently looking for interested parties from both D11 and Committee D20 on Plastics to participate in interlaboratory testing in order to develop a precision statement for ASTM D7605. Dick says that D11.12 is particularly seeking laboratories that have rotorless shear rheometers such as the RPA, APA, VTM and/or ATD. To purchase ASTM standards, visit www.astm.org and search by the standard designation number, or contact ASTM Customer Relations (phone: 610-832-9585; service@astm.org). ASTM International welcomes and encourages participation in the development of its standards. For more information on becoming an ASTM member, visit www.astm.org/JOIN. ASTM International is one of the largest international standards development and delivery systems in the world. ASTM International meets the World Trade Organization (WTO) principles for the development of international standards: coherence, consensus, development dimension, effectiveness, impartiality, openness, relevance and transparency. ASTM standards are accepted and used in research and development, product testing, quality systems and commercial transactions. ASTM Committee D11 Next Meeting: Dec. 6-9, December Committee Week, New Orleans, La.
Technical Contact: John S. Dick, Alpha Technologies, Akron, Ohio, Phone: 330-848-7207; john.dick@dynisco.com
www.astm.org
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