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What’s New in Medtech Materials

Medalist MD-34900 and MD-36975 Medical-Grade Thermoplastic Elastomer (TPE) CompoundsTeknor Apex Co.Medalist MD-34900 series compounds, available in 50, 60, and 70 Shore A grades, are for general medical overmolding applications, while the MD-36975 grade is a 75 Shore A TPE designed specifically for overmolding in wearable devices, offering resistance to lotions and disinfectants typically encountered, explained Teknor Apex. The medical-grade TPEs are made only with FDA-listed food-grade ingredients, are ISO 10993-5 compliant for biocompatibility, and are compliant with CONEG, RoHS, and California Proposition 65 requirements, the company reported in a news release. “Medalist TPEs are excellent alternatives to liquid silicones used in overmolding because they do not require the use of a primer, have a shorter cycle time (avoiding the lengthy curing process), and can be processed on conventional injection molding equipment,” explained Ross van Royen, senior market manager for Teknor Apex, in the release. “We’ve made substantial investments in adhesion-modified technologies for TPEs, increasing our understanding of adhesion, developing more cost-effective formulations, and improving the bonding capabilities of these products in complex part designs.” Teknor Apex collaborated with Covestro LLC to overmold these materials onto various medical grades of Makrolon PC as well as Bayblend and Makroblend PC alloys, using both insert and multi-shot molding. Peel strength data showed the Medalist compounds exhibiting excellent adhesion to Covestro’s engineering thermoplastics. The two companies presented a co-authored white paper with details of the experiments and product performance at MD&M West.
Several new material developments were announced at Medical Design & Manufacturing (MD&M) West 2020.
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