Graphene oxide/rubber composites were experimentally investigated for obtaining their thermal properties. Three kinds of the composite matrix material have been used: NBR, HNBR and FKM. The reduced graphene oxide in the form of crumped flakes has been applied as the filler influencing on thermal conductivity of the composites. Two values of graphene oxide weight concentration have been taken into account in the investigation. Thermal conductivity of the composites and basic matrix has been measured by the professional apparatus with the use of the guarded heat plate method. Before measurements the preliminary tests using the simplified comparative method have been performed. The results obtained, both from preliminary tests and using the guarded heat plate method, show an increase in thermal conductivity with increasing the reduced graphene oxide content in the composite. The experimental investigation allowed to determine not only the increase in thermal properties of graphene oxide/rubber composites compared to the basic matrix, but also the absolute values of thermal conductivities. Additionally, the SEM analysis showed that the tested composite samples contain agglomerates of the rGO nanoparticles. The occurrence of agglomerates could affect the composite thermal properties. This was noticed in the comparatively measurements of the temperature of different composites during the heating of samples tested. The maximum enhancement of thermal conductivity obtained was about 11% compared to the basis matrix of the composites tested.

Application of permanent magnets bonded by rubber is still growing, especially in the automotive industry. Magnetic and mechanical properties of permanent rubber magnets can be tailored by a production's technology and a magnet's composition. Permanent magnets bonded by rubber are produced by a method called calendaring. Physical properties of rubber bonded permanent magnets depend on a type and amount of hard magnetic powder in a mixture with rubber. Anisotropic strontium ferrite powder and spherical isotropic Nd-Fe-B alloy powder were used in research. The results of measurements show that with an increasing amount of ferrite powder magnetic properties and Shore hardness increase whereas tensile strength decreases. Addition of Nd-Fe-B powder to the mixture instead of some ferrite slightly increases magnetic properties of magnets.