Mechanical Supplies

Sound Absorbers & Noise Barrier Composites

About

Barrier/absorber composite panels bonding an absorptive quilted fiberglass or foam face to a limp mass septum, so one product absorbs the sound on the source side and blocks what remains. Facings include reinforced aluminium foil, perforated metal and cleanable film for wet or hygienic areas.

Application

Lined inside generator and pump enclosures, plant room walls, compressor housings and machine guards, and used as pipe and duct lagging. The composite build is what allows a thin lining to work: mass alone reflects the noise back into the enclosure and raises the internal level, which is why a barrier-only lining often makes the operator's position worse while improving the reading outside.

Standards & Reference 5 cited

ASTM C423 (NRC)
Sound absorption measured in a reverberation room, reported as the Noise Reduction Coefficient. Absorption, not insulation: how much sound a surface soaks up rather than blocks.
ASTM E90
The laboratory measurement of airborne sound transmission loss: the raw data a partition's acoustic rating is derived from.
ASTM E413 (STC)
Sound Transmission Class: the single number that summarises an ASTM E90 measurement, used to compare partitions and doors.
ASTM E84
Surface burning characteristics: the flame spread index and smoke developed index a material is classified by. Class A is the usual requirement in an occupied building.
ISO 11654
The international rating of sound absorbers, giving the single-figure αw used in European acoustic specifications.

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