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Fiberglass Composites

Model PC

Fiberglass Composites

Description

Model PC composites, when attached to an enclosure or barrier, both increase its sound transmission loss rating, and increase its capability to absorb reverberant sound.

PC Composites are available as single composites and double composites. Single composites (PC 410 GOD and PC 410 GBD) are used to add damping to an enclosure and to increase absorption. Double composites (PC 410/410 GOD and PC 410/410 GBD) are used to add decoupled mass to an enclosure, increasing both absorption and transmission loss.

Kinetics single composites (PC 410 GOD and PC 410 GBD) contain mass barrier/damping sheets which can be attached to an enclosure or barrier to reduce vibration, thus increasing its transmission loss capability. The fiberglass absorption layer, either unfaced or with a black high-temperature facing, provides additional sound absorption on the noisy side of the enclosure or barrier.

Kinetics double composites (PC 410/410 GOD and PC 410/410 GBD) contain a 0.50 PSF (2.5 kg/m2) mass layer which is separated from the enclosure or barrier by a fiberglass decoupling material, which yields far greater sound transmission loss than could be achieved by adding mass directly to the barrier. The fiberglass absorption layer, with a black, high-temperature facing, provides additional sound absorption on the noisy side of the enclosure or barrier wall. To achieve the best structural strength, it is recommended that double composites be mechanically fastened to the barrier especially on vertical or overhead applications.

Kinetics double composites are most often used in the lining of enclosures around industrial process machines or as part of OEM components to reduce sound transmission. Kinetics fiberglass composites are available in 36" x 42" (914 mm x 1067 mm) sheets, and can be die cut or saw cut to customerspecified dimensions.

Application

Model PC Fiberglass Composites are recommended for direct attachment to noisy equipment enclosures or cabinets. They are particularly effective when adhered to the inside of cabinets or enclosures surrounding a noise source. They are recommended for applications where high ambient temperatures may be encountered. Because Model PC Composites contain a mass barrier, or damping sheet, they increase sound transmission class (STC) ratings of cabinets or enclosures.

Typical applications include:

Sound Absorption Coefficients

Model Frequency, Hz
125 250 500 1000 2000 4000 NRC
PC 410 GOD 0.10 0.40 0.35 0.54 0.73 0.85 0.57
PC 410 GBD 0.22 0.56 0.70 0.71 0.51 0.28 0.62
PC 410/410 GBD 0.22 0.56 0.70 0.71 0.51 0.28 0.62

Sound Transmission Loss

Model Frequency, Hz
125 250 500 1000 2000 4000 STC
Adhered to 18 Ga. Steel PC 410/410 GBD 20 32 44 61 64 60 43
Adhered to 1/4" (6 mm) Plywood PC 410/410 GBD 13 29 39 60 61 59 37

Single Composites: to add damping and absorption to a barrier surface

PC 410 GOD: Mass layer/damping sheet, with adhesive transfer surface. 1" (25 mm), 4 PCF (64 kg/m3) unfaced fiberglass absorber

PC 410 GBD: Mass layer/damping sheet, with adhesive transfer surface. 1" (25 mm), 4 PCF (64 kg/m3) black faced fiberglass absorber

Double Composites: to add decoupled mass and absorption to a barrier surface

PC410/410 GBD: 1" (25 mm) 4 PCF (64 kg/m3) decoupling fiberglass, 0.5 PSF (2.5 kg/m2) mass layer, 1" (25 mm), 4 PCF (64 kg/m3) black faced fiberglass absorber

Specifications

Noise control materials shall be a combination of a limp, flexible, acoustical barrier permanently adhered to a fiberglass decoupling/absorption layer.

The acoustical barrier shall be bonded, mastic, acoustical sheet material with a nominal thickness of 0.059" (1.5 mm) and a mass density of 0.50 Ib/sq. ft. (2.5 kg/m2).

The fiberglass absorption layer shall be 4 PCF (64 kg/m3) density fiberglass with a nominal thickness of 1" (25 mm) bonded to one side of the barrier sheet. The fiberglass decoupler used in double composites shall be 4 PCF (64 kg/m3) fiberglass with a nominal thickness of 1" (25 mm) bonded to the opposite side of the barrier sheet.

The fiberglass absorber facing used on PC 410 GBD composite shall be a black, vinyl-coated, fiberglass cloth capable of withstanding high temperatures. The facing shall be bonded to the fiberglass absorber on the face opposite the acoustical barrier.

Fire ratings shall be as follows:

Maximum Temperature:

Component Breakdown:

Noise control materials shall be Model PC, as manufactured by Kinetics Noise Control, Inc.

Fiberglass Composites
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