A previous paper (Talamini, G., Visentini, A. and Kerr, J., Polymer 1998, 38(10), 1879) has dealt with the first stage of the bulk and suspension polymerisation of vinylchloride where the reaction occurs contemporaneously in two phases, one of them very dilute and the other one very concentrated in polymer. The present paper deals with the second stage of polymerisation extending from the conversion at which the dilute phase disappears up to the limiting conversion. In this stage the reaction occurs in an homogeneous and more and more viscous environment. From an analysis of the curves, polymerisation rate versus conversion degree, it results that the chemically initiated polymerisations are submitted to the combined action of the gel effect and the lowering of the initiator efficiency. A kinetic equation, obtained through small modifications of the ＇Gelfunction＇ of Weickert and Thiele (Plaste Kautsch., 1983, 30, 432), is suggested. The suggested equation expounds quite well the kinetic feature of reactions initiated by different initiators. A comparison between chemically and gamma radiation-initiated polymerisations, is also carried out.