Investigation of the possibility to regulate the boundary processes in the composite material made from scrap tires and polymer binder must be considered as a perspective direction so that to regulate the essential properties of composite material. The modification of rubber crumb was performed by means of treatment with inorganic acid in order to improve adhesive interaction between rubber and polymer binder. The influence of rubber crumb modification on such parameters as Shore C hardness, tensile strength and elongation at break, impact strength, apparent density of composite material in correlation with its composition and adhesion between rubber and polymer binder were investigated. Close correlation between composition, modification of rubber crumb and selected properties of the composite material was demonstrated.