Adhesion of TPEs on Polycarbonates for Medical Wearables
When it comes to overmolding medical devices, material selection is critical. Recently, Teknor Apex teamed up with Covestro to evaluate the adhesion of Medalist® medical-grade TPEs to various polycarbonates and blends (PC+ABS and PC+ polyester), using 2K and insert molding. Download this technical paper to learn more.
Abstract
Thermoplastic elastomers and polycarbonates offer an interesting combination of rigid and soft materials for housings and interfaces in wearable applications. This study examines adhesion and chemical resistance for medical-grade resins that are candidates for wearable applications. Peel strength measurements overmolded test pieces of Makrolon®, Bayblend® and Makroblend® alloys showed strong adhesion to various grades of Medalist® TPE. All specimens showed cohesive failures during peel tests. Slightly higher peel strengths were obtained for direct 2-shot overmolding than with insert molding. Chemical resistance tests for these materials against suntan lotion and isopropyl alcohol suggest that Medalist MD-36975 and Makrolon 2458 are excellent choices of candidate materials for wearable devices.
Bayblend®, Makroblend® and Makrolon® are registered trademarks of the Covestro Group
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