WEB EXCLUSIVE: A high-flow polycarbonate and three TPUs have been introduced for medical applications by Bayer MaterialScience LLC, Pittsburgh. Makrolon 2258 is a PC with internal mold release that is aimed at growing demand for smaller, less intrusive medical devices with thin walls (down to 0.014 in.) and long flows (to 15 mm). It has an MFR of 37 g/10 min at 300 C.
Bayer also introduced these medical-grade TPUs:
•Texin RxT70A: At 70A Shore hardness, it is the softest of Bayer’s medical grades. It’s a plasticizer-free polyether for extrusion of tubing, profiles, catheters, and catheter balloons. It can also be used for gaskets and soft overmolding, such as grips. It boasts fast cycles.
•Texin RxHM125 is the hardest grade in the medical line, a clear polyester with 87D hardness and flexural modulus of 330,000 psi. It’s similar to PC in modulus but has excellent chemical resistance.
•Texin RxSTX120 is an opaque cream/ivory grade with hardness and flex modulus similar to RxHM125. However, it has tenfold higher impact strength—16 ft-lb/in.—and is aimed at molded connectors, clips, and luers.