This document specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether. This document applies to tetrafluoroethyl tetrafluoropropyl ether produced from tetrafluoropropanol and tetrafluoroethylene as raw materials. The CAS number is 16627-68-2, the molecular formula is C5H4F8O, and the molecular weight is 232.07.