Waste tire is a major environmental challenge because it takes years to degrade naturally and can release harmful pollutants into the environment, such as heavy metals, volatile organic compounds, and particulate matter. It can also contaminate soil and water, and pose a health hazard to humans and animals. Recycling waste tires is one of the most environmentally friendly ways to reduce its environmental impact. Recycled waste tire rubber (WTR) can be used to make a variety of products, such as rubber mats, asphalt, and composites. This study investigated the distinctive physical properties of waste tire rubber powder using the density bottle method and sieve analysis. The compositional, morphological, crystalline structure, functional groups, and thermal stability of WTR powder were also studied using SEM–EDS, XRD, FTIR, and TGA, respectively. Results showed that the grain size distribution was relatively uniform, with a gradual transition from fine to coarse. The moisture content of the powder was 0.964%. FTIR and DSC analyses showed that natural rubber and synthetic rubber were the main components of waste tire rubber powder. Compositional analysis showed the presence of iron (Fe), which corresponds to the steel belt used in tire manufacturing.