A process for the ring opening {TAIL ~ 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, {HEAD ~ preferably 0.5 10 mols} per mol of phospazene base 
A process for the ring opening { TAIL ~ 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 , { HEAD ~ preferably 0.5 10 mols } per mol of phospazene base
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