Recycling and utilization of used vehicle tyres still must be considered as an important way to unload the environment from non-degradable waste [1]. Production of composite materials [2] is one of most perspective ways for the reuse of scrap tyres, and the produced composite material can be used in a wide range of applications [3]. In our previous investigations optimization of composition and technology of the composite material’s production from mechanically grinded scrap tyres and polyurethane type binder were realized [4,5]. The special objective of this work is to investigate correlation between selected mechanical properties of the composite material and reactivity of the polymer binder.