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 water, preferably 0.5 10 mols per {HEAD ~ mol} of {TAIL ~ 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 water , preferably 0.5 10 mols per { HEAD ~ mol } of { TAIL ~ phospazene base }
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