Material selection is a critical decision in the optimal designDesign of every manufacturing process and product. Thus, to help producers select the best material for a given purpose, an efficient material selection procedure must be put in place. This technique is used for ranking the substitute materials, for which multiple requirements are taken into account at once. The application of multi-criteria techniques is highlighted in this study, especially those based on complex proportional assessmentComplex proportional assessment (COPRAS) (COPRAS) to determine the optimal soundSound-absorbing material in a given working environmentEnvironment. This study examined sixteen substitutes based on their suitability as sound-absorbing materials; the attributes of these alternatives were derived from various evaluations of the literature. A comprehensive list of all options is obtained and evaluated from best to worst while taking material selection criteria into consideration. Among all the alternatives, polypropylene give the best and bamboo give better. Following the rankings established by earlier research, this example provides a list of options ranked from best to worst. The authors think that this methodology can be helpful for various problems in this and other study fields.