| http://www.w3.org/ns/prov#value | - ble from Solvay, or CF3CFHCFHCF2CF3, available from DuPont; and hydrofluoroethers, such as methyl perfluorobutyl ether or ethyl perfluorobutyl ether, or C3F7CF(OC2H5)CF(CF3)2, available from 3M. Various blends of these materials with organic solvents can be used. [0059] The compositions may contain further components such as, for example, one or more hydrocarbon silanes, i.e. silanes that are subs
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