United States Pharmacopeia USP 26, NF21, 2003 Class VI certified elastomer O-rings and sealsThree chapters are applicable to elastomers, plastics and polymeric materials. PPE manufactures O-rings and other sealing components from a range of USP Class VI compliant elastomers:-* Chapter 87 (biological reactivity in vitro testing): EPDM, Silicone, FKM, FFKM (Perlast®)* Chapter 88 (biological reactivity in vivo testing): EPDM, Silicone, FKM, FFKM (Perlast®)* Chapter 381 (physicochemical tests - closures for injections): EPDM