Rigidized® Metals has tested the 6WL® and 1RL patterns on perforated stainless steel with both 1/2" and 1" deep acoustic insulation.
Test Methods: The following tests were conducted in full accordance with the American Society of Testing and Materials (ASTM) method C 423-09a, "Standard Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method".
C 423-09a: The specimen was tested in a Type A mounting, as defined by ASTM Practice E 795-05. Samples were laid directly onto the floor; since these products had finished edges, no additional framing was used.
C 423: The detailed results of the tests, including third octave band absorption data, the Sound Absorption Average (SAA), and Noise Reduction Coefficient (NRC) single number ratings, are presented here. Testing was at 27ºC, 47% relative humidity and 83.0 kPA ambient pressure.