Our laboratory in Minnesota provides fully-accredited ASTM C423 testing of absorption panels, ceiling tiles and other absorptive materials. Let us know how we can help.
Accredited ASTM C423 - Standard Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method. ISO/IEC 17025:2017 accredited through A2LA Certificate 4240.01
Sound absorption tests are performed per a stringent protocol established by The American Society for Testing and Materials (ASTM). North Orbit performs these tests in accordance with ASTM and is fully accredited by A2LA. The result of the ASTM C423 test is a Sound Absorption Average (SAA) or Noise Reduction Coefficient (NRC).
ASTM C423 is conducted on a test specimen that is installed in a reverberation chamber. The chamber is designed so the decay rate of highly-diffuse sound can be measured with and without the absorptive test specimen. Loud noise is created by a reference sound source which produces an interrupted sound stream in the reverberant chamber. Sound decay is measured with the specimen in place then compared to the sound decay of the empty chamber. ASTM C423 recommends test specimen be a total of 72 sq ft in dimension (or a minimum of a 64 sq ft). The test results will be expressed as the Sound Absorption Average (SAA) or Noise Reduction Coefficient (NRC).
Research and Development
ASTM C423 is used to quantify the absorptive qualities of sound panels, ceiling tiles, office dividers & partitions, sound baffles, furniture and other acoustic treatments.
Product developers use ASTM C423 to refine and express the sound absorbing properties of their products. These products are then used in offices, studios, homes, theaters, military facilities, airports, hospitals and anywhere sound mitigation is a concern.
Architects and designers use C423 results to choose the best acoustic treatments when trying to achieve acoustically effective results. The ability to create an acoustically comfortable space frequently relies on the strategic placement and installation of absorptive materials. North Orbit tests these materials in order to quantify their acoustic properties.
Consultants use the detailed 1/3 octave absorption coefficients to accurately model the acoustic performance of spaces such as auditoria, theaters, conference rooms, lecture halls etc.
With 30 years of experience in acoustical testing and consulting, NOAL provides “above and beyond” service by interpreting, diagnosing, and problem solving your specific sound issues. NOAL's hard-working team is easy to work with and takes pride in making your job go smoothly.