Abstract Untreated air-cooled Oil Shale Heat carrier retorting waste ash (SHS was ground, Sieved into different mesh sizes and introduced into LLDPE matrix. Compounding was performed via simple laboratory kneader and gravimetric fed co-rotating twin –screw compounder. In current work rheological and mechanical behaviors of PE/SHC compounds are discussed. Oil Shale heat carrier retorting ash (SHC) is byproduct of oil shale industry and is oxide rich carbon black material 1 It was studied as potential functional filler in thermoplastic (i.e. PE) That is because CHS consist multi oxides that could offer potential property enhancement and could lower consumption of naturally extracted mineral filler. Compounding of PE with SHC was performed at mass temperature 1800C. For SHC average particle sizes of ≥20, 20-45, 45- 70 µm and amounts of 10, 20, 30 w% were tested. Compounded materials were formed into samples for rheological, thermal and mechanical testing. Shear viscosity values for the composites slightly higher than values for neat PE but insignificant influences were wicked when varying filler parameters. SHS increased tensile modulus but decrease tensile strength and elongation at brake. The reason could be filler matrix interfacial debonding which needs compatibilities agents. References 1. Sedman A. Talviste P. Motlep R. Geology 131-132, 37-44, 2012.