In Thailand, the quantity of old tires has been increasing annually, posing a significant environmental challenge due to their non-biodegradable material. However, old tires contain an internal porous structure, which suggests their potential application as sound-absorbing materials. Porosity is a key characteristic that enables materials to trap sound waves, making them effective for noise reduction.

Therefore, this study aims to investigate and develop sound-absorbing materials from old tire rubber powder. The methodology involved:

• Mixing old tire powder with fresh latex at a ratio of 1:2
• Drying at a temperature of 120°C for four hours

Subsequently, the physical properties influencing sound absorption, including density, porosity, and water absorption, were analyzed. The results indicated that the sound-absorbing material produced from old tire rubber powder showed a density of 0.96 g/cm³, a porosity value of 0.45, and a water absorption of 11.03%. Therefore, the findings suggest that old tire rubber powder has the potential to be effectively utilized as a sound-absorbing material.