| http://www.w3.org/ns/prov#value | - here there are particular reasons for using esters having relatively small e.g. C.sub.1 to C.sub.6, especially C.sub.3 to C.sub.5 secondary alkyl groups, such as iso-propyl, groups, or mixtures including relatively high proportions of suchesters e.g. to have a fluid with a particularly low viscosity, the potential for difficulties arising from interaction with conventional elastomeric seals may be
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