Abstract: This paper deals with the study of properties for recycling tires toughening thermoplastic polymer. Large amounts of
waste that arise daily as a result of scientific and technological progress with increasing humane consumer goods. This gave rise
to the problem of the accumulation of the waste and its effect on the environment. So many researchers work to use this waste in
useful products, and thus can achieve economic and environmental goals. The objectives of this study are to incorporate ground
tire rubber (GTR) waste scrap into a thermoplastic matrix, recycled high density polyethylene (rHDPE) to improve the weakness
of the mechanical properties due to the lack of compatibility between two polymers, a surface treatment was achieved by
recycled polystyrene solution to increase the bonding between rHDPE and GTR and the properties of the blend were determined
and compared. Several tests were conducted to determine the specifications of the resulting mixture with addition different ratios
of GTR, such as tensile strength, bending strength, hardness, density, optical microscope examination and scanning electron
microscope. The results show that the results showed improvement in tensile strength, bending strength and hardness, on the
other hand, a decrease in elongation comparing with untreated samples.