Sound Absorption Coefficients of Natural Materials Database

This database is a working compilation of the sound absorption coefficients (α) of various natural materials for the octave band frequencies (125, 250...4000 Hz), when data is available. Additional physical properties of these materials, including thickness, density, airflow resistivity, and noise reduction coefficient (NRC) are included when available. Examples of materials in the database include kenaf, fibers, wood, food waste products (corn husk, fruit stone wastes, etc.), and animal byproducts (chicken feathers, sheep wool, etc.). Additionally, reference links are also included for each material, for easy reference to the original work/data. The data was gathered from published results in peer-reviewed scientific journals, whether through the papers' graphs/figures, which were then analyzed using the PlotDigitizer tool, or the papers' data tables. The aim of this database is to provide a central location of acoustical data for sustainable materials, in the hopes that researchers, scientists, teachers, students, or interested members of the public can easily access and utilize this data, whether for acoustical, environmental, sustainability, engineering, physics, mathematical, computational, or personal purposes.