Other suitable nonionic fluorinated hydrocarbon surfactants are those wherein fluorinated hydrocarbon portions exhibits a branched chain structure and which an aliphatic perfluorocarbon group at one end of the chain, such as those having the formula: Rf (OCH2 CH2)q OR wherein R is a lower alkyl, suitably CH3, q is from 2 to 20 and Rf is C8 F15, C10 F19 or C12 F23.