The bulk polymerization of methyl methacrylate which were carried out in a metallic dilatometer and DSC have been studied over the complete course of the reaction. An attempt was made to quantitatively express the relation on the onset of gel effect and the final conversion with polymerization conditions such as temperature

kinds and concentration of initiators. It was demonstrated further that the final conversion of polymerization in homogeneous ideal systems is only dependent on reaction temperature.