Fiberglass Sound Absorbers

Fiberglass Sound Absorbers

Kinetics PA fiberglass board sound absorbers are effective in controlling reflective airborne noise in high temperature environments when direct attached to the interior of the equipment enclosures.


Kinetics PA Fiberglass Absorbers are molded 4' x 8'(1.2 m x 2.4 m) fiberglass boards which are designed to provide sound absorption over a broad frequency range. Model PA Absorbers can be glued, attached with nails or "stick pins", or supported by a framework and are available unfaced or faced in 1" (25 mm) thickness.

The unfaced absorber, PA 410 GO, exhibits very good absorption at mid and high frequencies, but may exhibit dusting and some deterioration if foreign objects come into contact with the surface.

The faced absorber, PA 410 GB, exhibits very good absorption at low and mid frequencies. The protective facing, however, allows use in a wide variety of applications with minimum risk of damage or moisture absorption.

Facing on PA 410 GB is rated Class 1, and can be used in applications up to 450°F (232°C).


Kinetics PA sound absorbers are recommended for direct attachment to the interior of noisy equipment enclosures. They are effective in controlling reflective airborne noise in a high temperature environment.

For applications where airborne dust, dirt, or oil are present, it is suggested that the model PA 410 GB be used in order to protect the fiberglass core from contamination.

Typical applications include:

  • Interior lining of engine compartments
  • Sheet metal equipment guards
  • Light gauge aluminum or metal ducts
  • Pump or other electric-motor driven equipment enclosures
  • Portable engine-generator cabinets
  • Air compressor enclosures
  • In-Plant personnel booths
Physical Properties
Product PA 410 GO PA 410 GB
Density #/ft3 (kg/m3) 3 (48) 3 (48)
Product Thickness 1" (25 mm) 1" (25 mm)
Board Size 4' x 8' (1.2m x 2.4m) 4' x 8' (1.2m x 2.4m)
Facing Material None Vinyl Impregnated Fiberglass
Facing Color None Black
High Temperature Limit 350°F (177°C) 450°F (232°C)
Facing Flame Resistance    
    Flame out, See, max - 2.0
    Afterglow, See, max - 2.0
    Char length, See, max - 2.0
Sound Absorption Coefficient
Model Frequency, Hz
125 250 500 1000 2000 4000 NRC
PA 410 GO 0.03 0.22 0.69 0.91 0.96 0.99 0.70
PA 410 GB 0.22 0.56 0.70 0.71 0.51 0.28 0.62
Fire Ratings

Maximum Temperature

  • PA 410 GO = 350°F (177°C)
  • PA 410 GB = 450°F (232°C)

Component Breakdown

  • 1) Fiberglass Core
    • K factor per ASTM C-177 = 0.230
    • Surface Burning Characteristics per ASTM E-84
      • Flame Spread = 15
      • Smoke Development = 0
      • Fuel Contribution = 15
  • 2) Black vinyl impregnated fiberglass facing on PA 410 GB, rated UL-84 Class 1
    • Flame Resistance
      • Flame Out =2.0 Sec. max.
      • After Glow = 2.0 Sec. max.
      • Char Length = 2.0 In. max.

Unfaced fiberglass noise control absorbers shall be 3 pcf (48 kg/m3) density molded board with a nominal thickness of 1" (25 mm). The fiberglass shall be rated at NRC 0.70 for 1" (25 mm) thickness. Faced fiberglass absorber shall be 3 pcf (48 kg/m3) density molded board with a nominal thickness of 1" (25 mm), faced with a black vinyl-coated fiberglass cloth. The facing shall be factory bonded to the fiberglass absorber on one side.

Sound absorber materials shall be model PA, as manufactured by Kinetics Noise Control, Inc.

Industrial Noise Control

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