Standards and Procedures Applicable to USP Class VI O-Rings

SAE AS568 -- Titled "Aerospace Size Standard for O-Rings," this document is the "bible" of standard o-ring sizes. It lists hundreds of o-ring sizes with their dimensional tolerances.

USP 23 <88> -- Titled "Biological Reactivity Tests, In Vivo," this document contains testing procedures for rubber and plastics that will be used in direct or indirect contact with humans or animals. The most strict set of testing requirements is identified as "Class VI"

ISO 10993 -- An International standard for "BIOLOGICAL EVALUATION OF MEDICAL DEVICES". Contains test methods for materials to be used in medical devices. This standard identifies test requirements based upon specific applications and usage of the end product.