WEB EXCLUSIVE: At the recent MD&M West show in Anaheim, Calif., two suppliers introduced medical-grade TPE compounds. PolyOne GLS Thermoplastic Elastomers, McHenry, Ill., brought out Versalloy HC TPV grades with USP Class VI certification for high-stress, harsh environments. Available in three grades with Shore hardnesses of 45A to 70A, they boast unusually high flow, enhanced colorability, lower shrinkage, and improved tactile feel relative to standard TPVs. One likely use is overmolding onto PP hand grips.
In addition, a new styrenic TPE for wire and cable in medical devices was launched by Teknor Apex Co., Thermoplastic Elastomer Div., Pawtucket, R.I. New Medalist MD458 is an exact medical-grade analog of Teknor’s Elexar EL9431, a TPE with more than 20 years of use in non-medical wire and cable. Formulated on request by medical-industry OEMs, Medalist MD458 is a high-purity version that has passed ISO 10993-5 cytotoxicity testing and is made at Teknor’s dedicated medical compounding plant in St. Albans, Vt. It has a Shore hardness of 70A and UL-1581 continuous operating temperature rating of 105 C. It has also passed standard tests for oil resistance after seven days at 60 C and UV resistance after 720 hr exposure.