RADIATION-STERILIZATION OF NEW MEDICAL RESINS IN OXYGEN-FREE PACKAGING

摘要

In this work, several medieal-grade resins were studied for their color-recovery behavior after sterilization by radiation. Plastic parts irradiated in oxygen-free packaging showed that exclusion of oxygen significantly lengthened the time required for color-recovery, although the final color of samples sterilized in air and oxygen-free atmospheres were almost identical after both were exposed to ambient atmosphere for sufficient time. Newly-introduced Makrolon~R Rx2440, a high-flow polycarbonate formulated for radiation-sterilization in oxygen-free packaging completed its color recovery after 14 days when stored in 02-free packaging in the dark.