ASTM C 522 - 03 (Reapproved 2009) Standard Test Method for Airflow Resistance of Acoustical Materials

American Society for Testing and Materials (ASTM). Current edition approved Oct. 1, 2009. Published February 2010. Originally approved in 1963. Last previous edition approved in 2003 as C522 – 03. 6 p. This test method covers the measurement of airflow resistance and the related measurements of specific airflow resistance and airflow resistivity of porous materials that can be used for the absorption and attenuation of sound. Materials cover a range from thick boards or blankets to thin mats, fabrics, papers, and screens. When the material is anisotropic, provision is made for measurements along different axes of the specimen.