[en] Kinetic peculiarities of heptylmethacrylate radiation polymerization in the presence of SKN-26zh (MM∼700-2500) low-molecular rubber additions have been investigated. Kinetic measurements were made at 295 K and ⁶⁰Co γ-radiation dose of 5 kGy/h. An increase in rubber concentration in the compositions results in the decrease of initial polymerization rate and a less pronounced autoacceleration of polymerization observed in the process. Three-dimensional network formed during polymerization caused the violation of autoacceleration correlation with sharply increasing macroviscosity of the system