| http://www.w3.org/ns/prov#value | - These perfluoropolyethers are obtained by photo-oxidation of hexafluoropropene according to the process described in GB Pat. No. 1,104,482, and subsequent conversion of the end groups to chemically inert groups, in accordance with the description in GB Pat. No. 1,226,566. (2) C3 F7 O(C3 F6 O)m --B, wherein B can be --C2 F5, C3 F7, and m is a positive integer and such that the boiling point is in t
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