||Sound Absorption Properties of Acoustic Materials Defined With
ASTM C 423, Standard Test Method for Sound Absorption and Sound Absorption
Coefficients by the Reverberation Room Method has been revised
Update and modernize the instrumentation;
Provide a more uniform testing methodology;
Introduce the sound absorption average as a more comprehensive
single-number rating of material and product sound absorption;
Include laboratory qualification and quality assurance requirements.
C 423 provides an up-to-date test method that yields more accurate,
more comprehensive, and more consistent data on the sound absorption
properties of acoustical materials, says Steven Brown, senior
principal engineer, Steelcase Inc., Grand Rapids, Mich., and chairman
of ASTM Committee E33 on Environmental Acoustics. The revised standard has been re-issued
as a separate document for acoustical lab operators, architects,
interior designers, noise control engineers and other specifiers
of sound control materials, as well as manufacturers of acoustical
ceilings, open plan furniture, and other acoustical products.
A task group of Subcommittee E33.01 on Sound Absorption upgraded
the test method. They included acousticians, members of industrial
research and development, technical support, acoustical labs,
and providers of acoustical and sound-control material.
Data produced by the test method can improve applications of products
used in the building construction, architectural, acoustic materials
manufacturing, and noise control industries.
For further technical information, contact Steven M. Brown, Senior Principal Engineer, Steelcase Inc., CD-5E-16, 6100 East
Paris, S.E., Caledonia, MI 49316 (616/698-4551; fax: 616/698-4131).
Committee E33 meets Oct. 23-24 in Orlando, Fla. For meeting or
membership details, contact Staff Manager Steve Mawn, ASTM (610/832-9726). //
Copyright 2000, ASTM