WEB EXCLUSIVE: Teknor Apex Co., Pawtucket, R.I., recently revealed for the first time that its Medalist MD-200 Series TPEs are thermoplastic vulcanizates (TPVs). These grades, which have not been publicized before, are recommended for their high purity and resilience for replacing rubber in medical applications. Commercially, they have been shown to meet the requirements of ISO 7886 for single-use hypodermic syringe stoppers and to exhibit a low coefficient of friction (COF) for consistent travel force in glass and PP barrels.
Ranging in hardness from 15 to 80 Shore A, these TPV compounds do not need predrying, and their light natural color allows for efficient use of colorants. All grades have been certified to pass ISO 10993-5 and are Drug Master File listed with the U.S. FDA. They contain no extractable heavy metals commonly used in curing thermoset rubber.
Noting that the TPV technology for the MD-200 Series is one of multiple polymer chemistries employed by Teknor in its Medalist family of medical elastomers, senior market manager Keith Saunders says, “We uniquely manufacture our TPV compounds ‘from scratch’, starting with polymers and all other basic ingredients, rather than using a masterbatch intermediary.”
MD-200 compounds reportedly exhibit greater resilience than other TPEs, perform well in high-temperature end uses, and are more chemically resistent. They can be sterilized in steam, autoclave, or gamma irradiation processes. Most grades in the series adhere well to PP in over-molding.