A new series of Medalist medical-grade thermoplastic elastomer (TPE) compounds for over-molding exhibit strong adhesion to medical-grade polycarbonate (PC) and PC alloys and include formulations with enhanced resistance to chemicals encountered in wearable applications. Teknor Apex will introduce the TPEs at MD&M West in booth #2121.
Medalist MD-34900 series compounds, available in 50, 60, and 70 Shore A grades, are for general medical over-molding applications, while the MD-36975 grade is a 75 Shore A TPE designed specifically for over-molding in wearable devices, with excellent resistance to the lotions and disinfectants that are typically encountered.
In a joint project with Covestro LLC (MD&M West booth #2221), these materials were over-molded onto various medical grades of Makrolon PC as well as Bayblend and Makroblend PC alloys, using both insert and multi-shot molding. The project included tests to evaluate adhesion, processability, and chemical resistance. Peel strength data showed the Medalist compounds exhibiting excellent adhesion to Covestro’s engineering thermoplastics.
Teknor Apex recommends the new Medalist compounds for wearable devices, where TPEs contribute comfort; soft-touch or cosmetic grips for medical device housings, handheld devices, and instruments; and seals and gaskets. The accompanying table presents typical properties of representative grades from each series.
The new compounds for the medical device industry are an outgrowth of work carried on by Teknor Apex to develop over-molding TPE formulations for consumer products. The company has launched an online resource for overmolding to share their insights.
The Medalist MD-34900 series and MD-36975 compounds are available worldwide. As medical-grade TPEs, they are subject to strict formulation controls, 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. Teknor Apex produces these compounds in multiple ISO-13485-certified facilities, ensuring security of supply.