A supplier of cable assemblies for medical devices has replaced thermoplastic vulcanizate (TPV) elastomers, which is a standard material for these applications, with new styrenic thermoplastic elastomer (TPE-S) compounds from Teknor Apex Co. (Pawtucket, RI). Minnesota Wire (St. Paul, MN) cites the material's performance, both initially but especially following autoclaving cycles, as a reason for making the switch. A choice of colors instead of the standard-issue natural and black also helped tip the balance.
The TPE-S compounds are part of Teknor Apex's Medalist range of high-purity medical elastomers.
"We've tested the new Medalist compounds and found them to have better tensile and elongation properties than TPVs before autoclaving, and to retain more of these properties after multiple autoclave cycles—an important advantage in the many medical devices intended for reuse," said Jeff Lewison, Design Engineer at Minnesota Wire, in a press release distributed today. He also praises the material's stability during extrusion and improved molding processability, which allows the use of lower pressures, thus reducing the possibility of defects when overmolding onto delicate circuitry.