From Limtech

Silicone’s unique blend of characteristics including excellent biocompatibility with human tissue makes it the material of choice for the healthcare industry. Class VI silicones can be in contact with human tissue no longer than 29 days. Implantable grades of silicone can be implanted in the human body indefinitely.

Healthcare grades of silicone can be sterilized by all standard sterilization techniques including steam, ETO, and Gamma.