{HEAD ~ A process} for the ring opening polymerisation of cyclosiloxanes, which comprises contacting {TAIL ~ 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 mol of phospazene base 
comprises contacting
{ HEAD ~ A process } for the ring opening polymerisation of cyclosiloxanes , which comprises contacting { TAIL ~ 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 mol of phospazene base
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH