ASTM C 522 Standard Test Method for Airflow Resistance of Acoustical Materials
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ASTM C 522 Document Information:
Title
Standard Test Method for Airflow Resistance of Acoustical Materials
ASTM International
Publication Date:
Oct 1, 2003
Scope:
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.
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.
A procedure for accrediting a laboratory for the purposes of this test
method is given in Annex A1.
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.
Keywords:
- absorption
- acoustical materials
- airflow resistance
- airflow resistivity
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