A process for the ring opening polymerisation of cyclosiloxanes, which comprises contacting a cyclosiloxane with 1 500 ppm by weight of a phosphazene base, based on the weight of cyclosiloxane, in the presence of {HEAD ~ water}, preferably 0.5 10 mols per {TAIL ~ mol} of phospazene base 
A process for the ring opening polymerisation of cyclosiloxanes , which comprises contacting a cyclosiloxane with 1 500 ppm by weight of a phosphazene base , based on the weight of cyclosiloxane , in the presence of { HEAD ~ water } , preferably 0.5 10 mols per { TAIL ~ mol } of phospazene base
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