This document specifies the technical requirements, test methods, inspection rules, Marking, packaging, shipping, storage and security. This document applies to tetrafluoroethyl trifluoroethyl ether produced from trifluoroethanol and tetrafluoroethylene as raw materials. It is mainly used as an organic fluorine solvent and cleaning agent in chemical industry, electronic semiconductor and other industries. Molecular formula C4H3F7O; relative molecular mass 200.05 (according to the 2018 international relative atomic mass).