A new series of ultra-soft thermoplastic elastomers (TPEs) for use in medical applications has been launched by Teknor Apex (Pawtucket, Rhode Island / USA; www.teknorapex.com). Ultra-soft TPEs, or gels, are valued in medical devices for their cushioning properties but their surface tack and limited adhesion to PP substrates have presented challenges to designers. Teknor Apex said its “Medalist” range of medical elastomers overcomes these issues.

The Medalist "MD-16100" low-tack gels display less surface friction than standard TPE gels, providing smooth surfaces and improved haptics, Teknor Apex noted. These compounds can provide padding, support or cushioning in applications such as orthopaedic devices and prosthetic liners and can serve in diabetes therapy as insoles, heel cushions and toe spacers.

Medalist "MD-10100" gels for over-moulding onto PP have excellent adhesion, allowing flexibility of design and providing rigid components with built-in cushioning, explained the US firm. These gels are used in respiratory masks to give an air-tight, cushioning seal against the face. Other uses include orthopaedic devices and grips for handles or hand-held devices.

"New Medalist 16100 and 10100 series compounds are unique among TPEs in avoiding much of the tackiness that is typical with gels and overcoming their limitations in PP over-moulding. Their outstanding properties as cushions and liners make them cost-effective replacements for silicones,” said Ross van Royen, senior market manager of regulated products.

The gels comply with requirements by the US Food & Drug Administration (FDA) for food-grade ingredients, as well as ISO 10993-5 standards for biocompatibility and Europe’s REACH directive on substances of very high concern (SVHC). They are free of diethylhexyl phthalate (DEHP) and other phthalates, BPA and latex. Standard grades do not contain animal-derived materials. Both Medalist series are available worldwide.