The approval according to USP Class VI certifies that the product complies with recognized pharmaceutical regulations. These relate to the biocompatibility of plastics. The United States Pharmacopeia (USP) is responsible for approval.
The requirements for the products are graded according to six classes. Class VI is the category with the strictest requirements. Products with USP Class VI approval are therefore suitable for permanent retention in the human body and contact with the bloodstream.
Such requirements apply to implants, for example.