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Quiet Barrier™ Specialty Composite

999204 in stock



Quiet Barrier™ Specialty Composite blocks sound with four distinct layers of protection for maximum soundproofing power. The top polyester film layer resists heat, high-frequency sound and tearing. It is made so you can easily wipe it clean for simple maintenance. Underneath this layer is a thick foam that absorbs sound frequencies at all levels. This acoustic foam both cushions and insulates the barrier layer beneath.

That barrier is our Quiet Barrier™ LD soundproofing product that is superior at blocking sound. Finally, another thin layer of foam isolates the barrier layer from the mounting surface, further enhancing its sound-blocking function by reducing or eliminating vibration as well as airborne noise.

Composite Suitable for Many Applications

As our premium soundproofing composite, this product is suitable for the most extreme applications where you require noise reduction, including:

  • Construction sites
  • Automotive plants
  • Warehouses where heavy machinery is in use
  • Marine industries

This noise reduction composite’s ability to block some of the loudest and harshest sounds can be instrumental in protecting your workers and the community from the dangers of unchecked sound and noise pollution. Due to its incredible durability, this composite can be used even in places where other materials would falter in the face of high or low temperatures, extreme weather conditions, or harsh treatment.

It is easy to install and can fit almost anywhere you need sound blocking protection. For industrial-grade soundproofing, the Quiet Barrier™ Specialty Composite is the product you need.

This product is no longer available in the State of California. Please contact us for approved solutions. 1-866-949-9269

* This product is not eligible for promotional offers.


Dimensions 4 ft. x 4.5 ft.
Thickness 1 5/16 in.
Weight 18 lbs.
Coverage 18 sqft.
Quantity 1 sheet
STC Rating 24
NRC Rating 0.7
Availability Usually ships in 1-3 business days
Technical Data Product Data Sheet
Installation Step-by-Step Instructions

This product is no longer available in the State of California. Please contact us for approved solutions. 1-866-949-9269

* This product is not eligible for promotional offers.


Quiet Barrier™ Specialty Composite is a four layer soundproofing composite used in construction, automotive, heavy machinery and marine industries to reduce noise transfer from structural borne and airborne sources. Quiet Barrier™ Specialty Composite was engineered for applications where extreme noise is problematic and heat resistance is required. Quiet Barrier™ Specialty Composite has an intricate four layer construction, making it our premium barrier and acoustic foam soundproofing composite. The first layer is a fiber reinforced Mylar facing that blocks high frequency sound, resists heat, resists tearing and can be wiped clean. The second layer is a thick acoustic foam that absorbs low, mid and high frequencies. The third layer is our Quiet Barrier™ LD product that blocks sound energy. The fourth layer is a thin layer of acoustic foam that suspends the barrier layer away from the mounting surface. This layer structurally isolates the barrier layer, improving the sound blocking capabilities.

Sound Test

See how our Quiet Barrier™ Specialty Composite produced great results for a happy customer!

Quiet Barrier Specialty Composite Sound Test Video

Product Availability

Also available in Quiet Barrier™ Specialty Composite w/PSA

Special Order Sizes and Thicknesses are available.

For details, call 1-866-949-9COW.

Features / Benefits

Triple Soundproofing Function — The mass of the Quiet Barrier™ layer blocks sound while its flexible nature dampens sound energy. The thicker of the two layers of Acoustic foam acts as a sound absorber, decreasing ambient reflected noise. The thinner layer of acoustic foam acts as a decoupler, structurally isolating the heavy barrier layer from the construction assembly, ultimately decreasing vibration and increasing the sound blocking performance.

Heat Resistant — Quiet Barrier™ Specialty Composite has a fiber reinforced Mylar® facing that not only reflects high frequencies but also reflects heat back towards the source. This product is our best performing sound blocking material in exposed locations with above average temperatures.

Durable — The Mylar facing provides a cleanable, tear resistant surface for applications that may come in contact with oils or grease. Once punctured, the embedded fibers will prevent additional tearing or damage. The acoustic foam and barrier layers are thermally bonded, providing a much stronger, longer lasting bond over traditional adhesives.

Low Profile — Quiet Barrier™ Specialty Composite has a thickness of 1 1/4 inch, saving valuable square footage. Quiet Barrier™ Specialty Composite is used in many equipment enclosures where space is tight.

Ease of Installation — Quiet Barrier™ soundproofing composite is available with an optional “peel and stick” pressure sensitive adhesive (PSA). Simply peel the silicone coated paper backing and place the product where it is needed.

In-stock — We stock a large amount of Quiet Barrier™Specialty Composite in all advertised sizes and configurations. Most products are shipped the same day they are ordered and arrive at your project in three business days.

Customization — We will create a custom Quiet Barrier™ Specialty Composite for your application. Custom profiles, shapes and sizes can be quoted upon request. For custom Quiet Barrier™ Specialty Composites there are minimum order quantities, please contact our Acoustic Consultants for more information!

Flammability — Quiet Barrier™ Specialty Composite contains polyurethane foam that has a flammability rating of UL94 HF-1. Before choosing this product, be sure the flammability rating passes your local building code for exposed materials.



Construction Industry:

  • Air Conditioning Unit Enclosures
  • Computer and Server Rooms
  • Compressor Enclosures
  • Equipment Rooms and Enclosures
  • Generator Enclosures
  • HVAC Cabinets
  • Industrial Facilities

Automotive Industry:

  • Hood and Trunk Liners in Automobiles

Heavy Equipment Industry:

  • Engine Compartment liners
  • Cab Liners
  • Floor liners
  • Hood and Trunk Liners

Marine Industry:

  • Engine Compartment liners
  • Hatch Cover liners
  • Hull Liners

How Quiet Barrier™ Specialty Composites work

In essence, Quiet Barrier™ Specialty Composite products block the transmission of noise from one area to the next. The sound from the “noise source” hits the Mylar facing and high frequencies are reflected back towards the noise source. Some of the sound is then absorbed by the acoustic foam. The sound that penetrates the acoustic foam layer is then blocked by the decoupled barrier layer and reflected back into the room or space of origin. See figure 1. The difference between the source noise and the transmitted noise is the sound transmission loss.

Polyurethane Foam Warning

All Polyurethane Foams, including Combustion Modified Foams, will burn. Do not expose to any flame source. Once ignited, they can produce rapid flame spread, intense heat, dense smoke and toxic gases causing death. Warnings should be given to your employees and or customers. Test data does not necessarily reflect a foams performance under actual fire conditions. Before purchasing any foam, be sure to check with your local code officials to confirm the required flammability rating of exposed materials for your area.

Cautions and Limitations

Before applying this product all surfaces must be dry and clean, free of any grease or oil.

Installation Details

Tools Needed: Caulk Gun (for adhesive), Level, Utility Knife, Tape Measure, Pencil

Materials Needed: PL® Construction Adhesive (for products without PSA), Reinforced Aluminum Tape (for the seams)

Installation PDF

Quiet Barrier™ Specialty Composite Install

After 15 yrs. my boat started falling apart. All the foam that was in my engine compartment turned into dust overnight. I decided to use this Barrier Specialty Composite to replace it. This stuff is super! The only regret I had was not using the version with a sticky backing, I was a mess after I was done putting adhesive on myself. It’s much quieter than it ever was before.
Isaac D.

Specialty Composite worked exactly like I was told it would. It really stopped a good portion of the engine noise I was trying to get rid of. I was told I may still hear a little bit of the noise, but it is a whole lot more tolerable than it used to be.
Sam Johnson

"The times I talked with you on the telephone and corresponded through email you have been very helpful and efficient. I would highly recommend Soundproofcow.com to anyone!" S. CIMINO, LA