Norm

ASTM C522-03(2016)

Standard Test Method for Airflow Resistance of Acoustical Materials

54,27

Over deze norm

Status Definitief
Aantal pagina's 5
Commissie E33.01
Gepubliceerd op 01-04-2016
Taal Engels

1.1 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.

1.2 This test method is designed for the measurement of values of specific airflow resistance ranging from 100 to 10 000 mks rayls (Pa·s/m) with linear airflow velocities ranging from 0.5 to 50 mm/s and pressure differences across the specimen ranging from 0.1 to 250 Pa. The upper limit of this range of linear airflow velocities is a point at which the airflow through most porous materials is in partial or complete transition from laminar to turbulent flow.

1.3 A procedure for accrediting a laboratory for the purposes of this test method is given in Annex A1.

1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.4.1 Table 1 is provided for user to convert into cgs units.

cgs acoustic ohm

 

mks acoustic ohm (Pa·s/m3)

105

cgs rayl

 

mks rayl (Pa·s/m)

10 

cgs rayl/cm

 

mks rayl/m (Pa·s/m2)

103

cgs rayl/in.

 

mks rayl/m (Pa·s/m2)

394

mks rayl/in.

 

mks rayl/m (Pa·s/m2)

39.4

1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Details

ICS-code 91.120.20
Nederlandse titel Standard Test Method for Airflow Resistance of Acoustical Materials
Engelse titel Standard Test Method for Airflow Resistance of Acoustical Materials

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