Acoustiblok Soundproofing: Barium-Free Viscoelastic Polymer Material


Sound proofing material for sound isolation

Acoustiblok Soundproofing Material is used as a sound isolation material. It is typically installed before walls, ceilings and floors have been completed, thereby enhancing the Transmission Loss (TL) of these standard assemblies.
Acoustiblok® will typically raise the Sound Transmission Classification (STC) of any standard construction assembly. This is done by increasing internal damping, creating an airtight seal, and being flexible rather than rigid, unlike many construction materials.
Mass is important for sound isolation. Sound proofing materials do not need to be super heavy if it means they must also be super stiff and rigid.

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Acoustiblok is a U.L. Classified (UL # CLBV.R21490), viscoelastic polymer that comes in two forms:

  • Blok16 – 1/8th” thick sheet with a weight of 1 pound per square foot.
  • Blok32 – 1/4″ thick sheet with a weight of 2 pounds per square foot.

Both are made from recycled plastics and non-toxic minerals that are mixed and pressed into a membrane sheet.
These sheets are then trimmed to a standard size of 54” wide x 30’ long and rolled up for easy transportation. The rolls weigh roughly 135 pounds each at this size. Longer rolls ranging from 60’ long (at 270 lbs.), to 350’ long (at 1,575 lbs can also be manufactured.

Sound Transmission Classification

The Sound Transmission Class is a single number method of rating how well wall partitions reduce sound transmission. The STC provides a standardized way to compare products such as doors and windows made by competing manufacturers. A higher number indicates more effective sound insulation than a lower number. Acoustiblok will generally raise the sound transmission index.
Mass is important for sound isolation. Acoustiblok ranges from 1 pound to 2 pounds per square foot. That’s a lot of mass for a material that is between 1/8” to 1/4” thick! But mass is not the only thing needed to lower sound across a wide spectrum of frequencies.

Offsetting Diminishing Returns

An increase of about 5 STC is typical for each doubling of surface weight. This is a great result for the initial doubling, but the cost of each additional doubling offsets the gains in STC due to the law of diminishing returns.
Due to these diminishing returns, the best way to achieve high levels of sound isolation is to build a heavy, limp, and airtight assembly. If the mass of the assemblies increases while decreasing their stiffness, you will see significant gains in Transmission Loss as a result. This is due to bending-wave coincidence, where a flexible or resilient material can result in a coincidental gain in TL of more than 15dB at specific frequencies.
Sound proofing materials do not need to be super heavy if it means they must also be super stiff and rigid.
It is noteworthy that sound travels efficiently through dense solids. And every type of sound can excite your boundaries, causing them to resonate at different frequencies. As a result of this, you should know the frequency spectrum of your offending noise before any attempt to design and build an enhanced boundary.





Pump Noise

Are you experiencing a problem like the hum or whining of residential air conditioners?
The All Weather Sound Panels® (AWSP), Acoustifence® (AF-6), Acoustiblok® 16oz. (Blok16) and QuietFiber® 2 inch (QF‐2) are the solutions. The unique abilities of these products allow for simple, high performance, noise reduction solutions for the common problem of noisy air conditioners in or around a home.
For noise outside your home, the patented AWSP’s not only act as a sound isolation barrier, but also have a high level of sound absorption. This aids in reducing the overall noise level around air conditioners. Small, attractive, sustainable walls can be created to conceal unsightly air conditioners visually and audibly. If your budget requires a more cost-effective solution, Acoustifence® may fit the bill. Acoustifence is ¼” thick, flexible barrier with some unique attributes. Acoustifence® has high levels of internal damping. This means it dissipates the sound energy within its own mass extremely well. Just add it to an existing fence and hear the magic. On average, it can cut the noise level in half! If more reduction is needed, it’s easy to add QF-2 to absorb more of the sound around your air conditioners. QF‐2 is a sound absorption material that comes in large slabs making it simple to cut, shape, and install. Quiet Fiber is hydrophobic, mold and mildew resistant, and has an NRC of 1.0. That means, sound that initially strikes QF­‐2 does not reflect back toward the noise source. This is how it reduces the effects of boundaries or surfaces around your air conditioners. Ultimately lowering the noise level around the air conditioners.
For noise inside home, Blok16 can be utilized to reduce the noise from air conditioning handler rooms or mechanical rooms. The rumbling noise caused from resonance of the fan inside the handler. Just line the back side of the room with a curtain of Blok16 and for more reduction just insert some QF-2 in the room.

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